Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ba2dc856e5d2f2…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 00:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09c57a9959c85c2fb47e92292f5e90d4 SHA-1: 9ab789d60ae8b0137bd393a19ac6dfcca8497f8c SHA-256: c8ba2dc856e5d2f23d4e8346b1b26a029960e70c934324ed82ae151ca2d4c573
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=martin+eden+pdf+jack+london PDF link annotation
    • https://citronixdeflection.com/nbloom/fckuploads/file/resulux.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075944096461---3479725091.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b0eef8ae---debotakefexezeba.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jf12atj49lcdddelkdqssptn24/pefuvajija.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/11223860942.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ce916b9bcce1254ac56e8e3781e8dc2a/83915927675.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/94974145660.pdfIn PDF document text
    • https://dcimx.com/files/nidexatuwitosinaloj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf7ea9f009---zitamuzeferatiranaz.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/25025351355.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607752274c1ae---jewamuwonudedabegawevif.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/kobd8f6srr4vnq0g40ikjghjlr/90626863206.pdfIn PDF document text
    • https://areicon.com/images/file/wogosesosejudukewafezi.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/ce92659e29e73c48871608c0888773be/59397034580.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/jeduzesazexivaxafexege.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986de737717---76115647791.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28cee8104---fapanemewaxoro.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/35432548063.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a9e8b0db043e96ccbe60f4d2594de7eb/bewugelawogifigud.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607213519e0e4---fejojixolerubu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482a24a36a---puzeluvakilemazibuge.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/merekivewize.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/loxezeg.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/27127892787.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///vifawirivijotunodawokopi.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 19380 bytes
SHA-256: 4cac9d31067f03416b72917a46aac410c6947210f595ba2f627645da9569b2c5
font_02_sfnt_off00013f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6E 10660 bytes
SHA-256: ae617df7ca388ed75c7bffac9fe416765a6bf595e0d89cc38204825a1371345d

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