Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f730d018dedd7b…

MALICIOUS

PDF

96.7 KB Created: 2021-07-07 15:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03ee9c672e5da66e36fb319369a57d76 SHA-1: 889fc37805a29363daa401d68a4ba7a418507c44 SHA-256: a3f730d018dedd7b8a23813bacff27f1a14db88c61b572d57b0674011bebb48b
204 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests SEO manipulation to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f80b24a1d---73780798732.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160828eeab5b2c---pusuzowekegegubitikawo.pdf
    • http://01host.ru/userfiles/files/86841483619.pdf
    • https://agronlogistics.com/userfiles/files/koludemadu.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1418e9b388---wupijefivokukuxideb.pdf
    • https://aulacvn.com/upload/fck/file/tuzubesalavosoxogubozo.pdf
    • http://naturallabs.fr/userfiles/file/redefulimevadene.pdf
    • http://ersatzmonitor.de/userfiles/file/25763301927.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/ef8ed66bf4730418b55227661cb4317e/59841852800.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/c53f1dc8069fd4f6b8aa18578cb15332/78936281948.pdf
    • http://rydelko.pl/userfiles/file/13607080164.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d995cce00---puwonilex.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607204c3c1354---ratoxexubuzufi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b941e5481d9---rularojixakajezulanetetuw.pdf
    • https://buka.ru/sadm_files/pazuvim.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcab908c5b---dulanalamefudida.pdf
    • http://www.kickcommerce.com/userfiles/file/49115866480.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/64689ef2a3b759a8be275112b93c66e8/modimenuminajoni.pdf
    • http://bagiez.de/userfiles/file/82644257688.pdf
    • http://anaminfo.com/attachfile/file/85313146444.pdf
    • https://prawobrzeze.info/userfiles/file/newegekukejexujefez.pdf
    • https://saunadlaciebie.pl/userfiles/file/kepeb.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/pm0nksd1pak7tkdohaph49kr14/70188655692.pdf
    • http://quickvideo.nl/userfiles/file/bekujupuwamalu.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ecb34965445395f03f4fb2a63921be5f/lokejumulezopil.pdf
    • http://suacona.com/clients/16856/File/47475194584.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=child+safety+questions+and+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_off000117a1.bin
4b06a8b2abea7c64bef27d2adb2d00cb6e86f0c5d9bd8ef491d1d33906d2edd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 10928 bytes
font_01_sfnt_off000130c7.bin
00b39f4fa213e916caaac6918f856a7eba02916c950f555cf3b14974aa3af8d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 17048 bytes
font_02_sfnt_off00015d61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D61 16792 bytes