Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a97fa4561697de7…

MALICIOUS

PDF

88.4 KB Created: 2021-06-27 05:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f6c531b23878b24acec458338d61fa6 SHA-1: d04923f23fd55a616227b4e0fda76975fe3f822b SHA-256: 7a97fa4561697de7ef06ac4e6873afd33db6a3379d70b74dc41ac7c10710ca15
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The document contains numerous links to external resources, many of which point to compromised WordPress installations, suggesting an attempt to distribute further malicious content or phish users. No scripts were extracted, but the presence of external links and the overall heuristic profile strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bfa583c81cd1ced1162029d36477933a/woxuvukodisu.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/16d299f10e6a44d2f8d8286b9bb3a886/punitokobitanawobuji.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/podukojoziba.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c74fb1d91---3760152747.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/86813595335.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61aeb0d21f---kalojuxubuvozen.pdf
    • http://grawerlik.pl/userfiles/file/retawo.pdf
    • http://minutemen-jrotc.com/clients/84940/File/20165245758.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e67d7b61b---puwugupisilozitofaxovij.pdf
    • http://talani.nl/userfiles/image/file/7022411858.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d783a9340---vapezonolelabupelijusema.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47c1d72e31---44968584200.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7envhvbkg81hq8m5ao1lv2i1i4/42732577073.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/eeb22ff3aa41f8e2e004e6d4097781d4/64445650433.pdf
    • http://amandatravel.com/userfiles/file/bamimaxini.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160b0839765de5---46521826971.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/dfjk0nsernotfjjfqpt0ifhv75/50514575961.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084987fba5ec---jizufa.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b41a3fbe3ed9b55691d9b1e283e7ad65/buxivirafupuxotevezeti.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1e778b7e---debaxunev.pdf
    • http://allamericannursing.com/userfiles/file/9525102757.pdf
    • https://baoholaodong24.com/userfiles/file/rovugamanabusof.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e18e9f5cac031d7d793d3d5cefc11894/gibejeset.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=escape+room+nuclear+countdown+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedb.bin
20b165669fce4fb076e6c5b426efbd3f1e5f553c239d7d4bd78c02e84fa081c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 19828 bytes
font_01_sfnt_off000121ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 16792 bytes
font_02_sfnt_off00013a06.bin
a042c645c5dc43fa9ecd23afea09aca0f45e30f199da9a78e6f648058c0c2a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A06 10752 bytes