Malicious PDF — malware analysis report

Static analysis result for SHA-256 455b752c98962bc1…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 19:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d66ae5c2a500ca4f9c6c1f098cf0d58 SHA-1: 07539d199a20f4c1ecf256eb973f88a1fa794068 SHA-256: 455b752c98962bc15552ef2cf997f765ecaeb83e9b008bb3e30f02f246e19823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bawaconstructions.com/editorData/file/68564051346.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d0cead3823c87a6f572f8ac2243218a6/21121995501.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/892b8ebd4b4f04e53e694de286314f5a/botomewuwemetigumitoduxug.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/surobiw.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/60104436256.pdfIn PDF document text
    • http://orthodoxnews.us/file/vituwarokuxelefemovosati.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/95669581249.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202108161017086188.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/latiwe.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b908e7fb2---gevivofudixuroxikitakofi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0cc213871df28177f0616155c36207f1/sesevonabadazu.pdfIn PDF document text
    • https://unitjaya.com/contents//files/xuganopodupazer.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/70530823565.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/841d3b7679fb156cc6640a39eb69fb43/vofuredufoweb.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160946b4de543d---10367506473.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/4913670479.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210725221055_x18dz4.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e5758686---kibimejinopa.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/gumuvebanilibenopev.pdfIn PDF document text
    • http://heizler.hu/files/file/44970706282.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d758knal30sgat98to45uls0p4/zokun.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9144a360a6---79893889576.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mjnathel6b5vfsd652q9v1eq9l/93135124917.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/mowukapitabikad.pdfIn PDF document text
    • http://fedime.org/imagenes/sanonexojokulugetedire.pdfIn PDF document text
    • https://synerhu.ru/uplcv?utm_term=jandy+pool+salt+system+manualPDF link annotation
    • 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
    • http://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off0000e9f7.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000e9f7.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 17932 bytes
SHA-256: c17bc6e35731b376d0ac5dec5057fa91063dc9d4cf96070fac4029667f703a96
font_01_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 10564 bytes
SHA-256: c1e4ce55eccf339f2487e40cf4260d2b772a0a54458ab1897af2653d0b0c8952
font_02_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1