Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c57d4e01f73881…

MALICIOUS

PDF

100.4 KB Created: 2021-06-10 02:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b2ed4acc3fed32388f0323fd17f24129 SHA-1: 73f3d50dac3f46d10ffe9dbedbcb59fc8411f991 SHA-256: a8c57d4e01f73881fdd6c97817281ea0a85ff7144a5e6c5d450332fb82db8296
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely to distribute further malware or engage in SEO abuse. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=area+of+triangle+sine+formula PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f57bee932---gifanozox.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26162bb73a---punediwegesezam.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/63143212971.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb835d7b3---86489744085.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a90551859b4---japilo.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/64582071073.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c1d315dadefc443911f8299b89828187/bukad.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c286085125---xefipo.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/62857130442.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/eabd44796c8ccee635a9b56b1ee725d6/78174489184.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/va26kfr3kv1au53439l513hd2o/38157253483.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/aec74af7dd51313daf72cec2e12f1382/10508698327.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dd13ba3c---30650559114.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/65030644082.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/31306781200.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0ce451d0---xisikukinesefofenetepegaj.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1rl7i7qt6ol77k1pnv9hnq1j83/sugobat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00012f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1A 5076 bytes
SHA-256: 41878fd209e01ea677bf5ec844fceecae789c6ae1515f6e24be6d25e6db24527
font_01_sfnt_off00014049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14049 13648 bytes
SHA-256: ed1183faa433dbf9fd1a94b98521ef366c06ed3348af3cc9754fca0cb7da9ea1
font_02_sfnt_off00016cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CDB 16332 bytes
SHA-256: bd7c12d9589467e8dca540529e57bd77518b63c76edf9a3b143810f656655510

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