Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73068be04631f82…

MALICIOUS

PDF

94.9 KB Created: 2021-09-06 07:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: baebea75ba01e4d1a98957cd08f7fa94 SHA-1: 4d9d8475f1fba14ffe304e516b58d9d47fa52e98 SHA-256: e73068be04631f8246a286f99eeef29c197c92c36137653eb055114fc1d9d026
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mollis.rs//files/zapigawosuwa.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a145d9af627---62914928896.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/17583506792.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/21145128964.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/17747637955.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096eb1d5bace---kelenajirumobinizitojunul.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/muwosenobesiwazuwoxulo.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/pomitijex.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/16287244297.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/gewolojeluzabasixik.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/73716761392.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/pidok.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/63540416735.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/semakajazalirelobato.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/poporokovolusexefelot.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63663c4ba03beca9440bb7bd0e58adc0/nefaxugutojut.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/56921442208.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/54520954862.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/40736591703.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27b9b110f---69659251235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=techniques+of+material+control+in+cost+accounting+pdfPDF 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 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_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 18108 bytes
SHA-256: 8daad421f99d51006cbddfa4e155bfb999d498444a30e66a2aca13db28ec56c9
font_02_sfnt_off00015410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15410 11276 bytes
SHA-256: ced392cb05e962d737f755734bea04e376d5be0378bb1ade01225eef9af75515

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