Malicious PDF — malware analysis report

Static analysis result for SHA-256 b641c22b28153b92…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 01:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 37b1f3d55ecfc2e854ff4e1fc0275444 SHA-1: c1e6274f73d360dd8901baae8090cd14b54248d4 SHA-256: b641c22b28153b92576de050b2e4733eea05b6c4bf14f8dbd3dbcd4c349b4527
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV. The SE_CALLBACK_LURE heuristic indicates it is designed to trick users into calling a phone number, likely for a scam. While no scripts were explicitly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, suggests a phishing or redirection attempt. The document's structure and embedded URLs point towards a callback phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=how+can+i+open+an+email+account+with+my+phone PDF link annotation
    • https://www.lipca.com/ckfinder/userfiles/files/58000593590.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/namimo.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/jagumimifewejazadepo.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a140c71836799f9c3023b21212715148/fubejerijiwadi.pdfIn PDF document text
    • http://dd-eng.com/files/files/75022482674.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/51236431570.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/likafebi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f9c34cb5---56288073356.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gfevpd1jm338ajamibdj0321l0/lotoxubefezuwiwuz.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d4eedfe49365a223f6fb2e462da9e7dd/3424842140.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/tufomo.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/jesomazevofokironirumona.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/dizadamijokuwozelonop.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e97fbbb5ca20e9fffdffc3b3a5483110/vitudig.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/dofokowonab.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/41647302433.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/piluxovulimikaxubonas.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/lunowaziro.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161392aaaa2173---nemoguk.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903061543.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/wugovi.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/19749953189.pdfIn PDF document text
    • https://2winit.com/Files/files/70814789571.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/11003066209.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_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 17644 bytes
SHA-256: f65cb977b9610c6ede5dbe01be8740dab4403bd0b6009c5b3c9a9bad84e9f554
font_02_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 10660 bytes
SHA-256: c84846bcde2b6ccabd7444ff3b035375c9714f8761eb026087979545f8ff6b86

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