Malicious PDF — malware analysis report

Static analysis result for SHA-256 7542163664815086…

MALICIOUS

PDF

76.8 KB Created: 2021-09-03 14:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 434036d58d2dfca78248dff68259905f SHA-1: a0f2200cbdae4df07d6d50b05df6f1d9a1bcaac7 SHA-256: 7542163664815086cf0ed6c0ad2ba15152468234b7fff468018e379acf10ebf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f3c7be023411994a007fc021e5f67416/feguvujamebajad.pdf In PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/xatazevunabikax.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/81331791145.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1611110f7713f1---77845435099.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/boxazajamagepofulizusif.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/13315988174.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/20368092183.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/38541661660.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/82371779313.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c0245c8cf---rifixazimomig.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb07504e054---65426365136.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/xafawolab.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/jasepidaliwagex.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/82546351290.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/tufoz.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e01516328---11742336290.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tunajigomowoto.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/44247398039.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1b6a50cb9789028fb1517f0f9f2aeca4/manisakesukapamifogemaju.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/badam.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/68008532844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=praise+his+holy+name+hillsong+chords+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 17176 bytes
SHA-256: 34ef81b5fb101e1323f4a383bc3a275e9b031ea67df0000e036304fabbf45ce5
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 11084 bytes
SHA-256: de3db9f51837032ed3655bca15e07edb55e9eff65dc19f36747cb3fd00e75dcd

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