Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9098658ee1a1d07…

MALICIOUS

PDF

91.2 KB Created: 2021-06-17 12:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 11cf58ba8be39fc554f11c3a9402f646 SHA-1: 5df3b8fe51299054c9fa450011af554c7f0e691b SHA-256: d9098658ee1a1d076831131333a3d83006ab637d7aad3ff67c11f3c9de2a24b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to programming books, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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://queure.ru/uplcv?utm_term=object+oriented+programming+c%252B%252B+robert+lafore+pdf PDF link annotation
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86101ca8a---51600149816.pdfIn PDF document text
    • https://5uempat.com/contents//files/5813992642.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072748086129---pubolejew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980f3b8a81---fiwemuwuse.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8887505bff---selunapopo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8cc9a852---papoxatawalazipu.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/93372383126.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/43384774552.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56705bddec---saxumexal.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d755183dcbdce1a28884483a31bac7c1/59516259377.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072274187a08---28835619608.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/t6vhcdj7p14688mk4tgsafscp2/sawetat.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/88821145421.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2c95d0368fb1cc684291ef79d343805/ropenulo.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/53865160029.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8655c143e---58121454128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 6568 bytes
SHA-256: 611f3db65d644b1c54ca9459fd1b922419f4f90529f892feeb7d4571f542e8e8
font_01_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 5540 bytes
SHA-256: 0794d42dfc0023294b1ee10a5d33a960dc6d680e80934e94523fb4b7a2f17fe5
font_02_sfnt_off000116a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 3064 bytes
SHA-256: d5fc5ebb6897ab93a9fe2eb47669d49e8c40c561b410a89dcb184cef4de999a4
font_03_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 11084 bytes
SHA-256: 529669cce591fe9d8c37d301bc27ac5fd18b95647359bd56d571b4251ac5e9ee
font_04_sfnt_off00014940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14940 16116 bytes
SHA-256: 5ec139a263af45d7cbac1bc1a000173eb4e7f97797aba0f35ce2e37505b4886e

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