Malicious PDF — malware analysis report

Static analysis result for SHA-256 151a2b457b9daf53…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 21:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 620e61313aa791f810fca8f21b163d9e SHA-1: 1c09396619f978fddaf67dbeed37dc885231252a SHA-256: 151a2b457b9daf5376eb2a1a5e1004abf3a7a760ca8b88ecec02b864e870f606
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. The document body is heavily obfuscated, but heuristics suggest it functions as a link farm and a callback lure, prompting users to call a phone number for support or to resolve a dispute. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into engaging with malicious actors.

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://pistant.ru/uplcv?utm_term=write+on+pdf+surface+pen PDF link annotation
    • http://lawngo.net/fckfiles/sikatozowafovokanugoxogow.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9485740d---33672601121.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bfb0c1568977df32ee24f1c2239669d7/70901271346.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ade71951304---71386559764.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/d8eb000febdf8fa68345f0875b505465/88171221872.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b860de5a---fesafuzilobakulemo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d97c4d61e5f1b5e751549bb2888a9c4d/xofupopeguxaralomokadowow.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/7127844047.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210812170424.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/77167270362.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2ef169e6b26b1f5177fcb5301958a010/ginozefopekedojozepebomuw.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/54139787816.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/kufixorusimen.pdfIn PDF document text
    • https://ahha.az/userfiles/file/68660246915.pdfIn PDF document text
    • http://cocoal.com/uploads/file/94004274234.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac34e3b57d---rarekex.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/fb5l984v2ghelin0853vdd4ag4/3571854037.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160805805bf4be---49873736362.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fd922e52339---79627684753.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18934ee487---7187113107.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6ef60c3552d1afc658ba747f2998fcf1/15781805228.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/zosazawilovamaj.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b165b06d9b---40014544206.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/16868228975.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893fbb043e5---77834037820.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16996 bytes
SHA-256: 13218ddbc85817e84c455acad7af670e50dec0e646d0d811416584eb686aa74d
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 10660 bytes
SHA-256: 449a37792fe9bba4d19f777e32136ded106d2a53c22d5ee7437802e03bf0d854

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