Malicious PDF — malware analysis report

Static analysis result for SHA-256 910694fdb51ec72b…

MALICIOUS

PDF

274.5 KB Created: 2021-06-15 18:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05ab5075e6e83ccf7b173f333f3cd6ec SHA-1: 5431f6aa4e9ec872661110940b103316534420a0 SHA-256: 910694fdb51ec72b5ac120a628e6db2bbe405680012af21ebebe5652a4290904
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates a link farm hosted on compromised WordPress upload storage. The presence of embedded URLs and the ClamAV detection further support its malicious nature, likely serving as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4850

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=winky+face+symbol PDF link annotation
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jlqd4dq400c4ns2nfcp3bj8r4g/8563518300.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081081c33026---55276633814.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/3dcb726c8d1a6278044ba244d4ab1639/puwuzunixapigewuwurofi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0599049f2---wusogafetisom.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24d34e72f---30223831695.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609888cd14a91---33907727564.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089af017dedb---53672421050.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/xatisebokadaliv.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/23602352750.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/na1pim588ek38m213fgvmi6jee/46180704001.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/29cf8a9c4f6c244f17cd815518d5f6b2/92515359777.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05043f4b6---40922550087.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b15e148e1---93529197711.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5a15b97c908d675b119afc3345f88ac8/98764298376.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608037a0185d9---bofexokiledusobazesutofo.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/mexowabexubobanonines.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 12

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001b274.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B274 1540 bytes
SHA-256: 9bc354310e00544940044f4295d3a3c0dc909490eb766d6ca0581567619785ae
stream_009_off0001c2ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C2EC 132036 bytes
SHA-256: 93c943a036b668b25e25a162209c1cf632bfd1aff06e70bf2ad25058085bd1e2
font_00_sfnt_off00013bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 6964 bytes
SHA-256: 33a71b8ea9d9cd1954a29f60e7d36fd67f4987d6ea2013dc5b42ca6fc54f6b05
font_01_sfnt_off00014d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D93 17140 bytes
SHA-256: 3a75794579fe5639a269f96b8bbb2a46dd61f7a4edb626fe2cbdb2141b25176e
font_02_sfnt_off0001849e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1849E 5248 bytes
SHA-256: bdfa18e8923537ea62691d0ba71fc361f8e8c1e6df886d7aa42a361e06b9520a
font_03_sfnt_off0001964c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1964C 7480 bytes
SHA-256: 0387a34f2a294f079a21b2727cbf8b0014616d2b38573d9e704cca6b495fab1c
font_04_sfnt_off0001a836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A836 2892 bytes
SHA-256: 910e30d6f0967c809b5e4e8641858feed3847f7cbfc0ca3cccb81a3ef01a7c5b
font_06_sfnt_off0001bab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAB7 1500 bytes
SHA-256: 68c6429f70734f4622a8bbe20d617502374d04f629511636c98913dc6dd5cc68
font_08_sfnt_off00033438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33438 20560 bytes
SHA-256: 404d418117125ef868c098e89eb85222b268aecd7ba1d32b838e4a15e5fb7691
font_09_sfnt_off0003753f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3753F 86644 bytes
SHA-256: 382c6d983ef1744cbc8b37bc2edd2bd1acedc5af68234c5471be3e67f54cf519
font_10_sfnt_off0004200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4200B 2120 bytes
SHA-256: 34627b4c26b8f0eb036c6a3c22f448853491973ba24543e0819dfd15d86508a7
font_11_sfnt_off00042767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42767 6252 bytes
SHA-256: 20bc280d68f02a1630ffdce0a75040b0dc165d120766adcc6df3618dd18735a8

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