Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acfd447bf01b384…

MALICIOUS

PDF

89.6 KB Created: 2021-08-01 18:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c355fd424ccf247e4c22e9c3edc52400 SHA-1: bd91878cce758f9a9f7809e9423ac95714007ae1 SHA-256: 3acfd447bf01b384aa4be73a800e16886c67e3df2731ae208d9abb2629e7ee90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document containing a link farm hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The presence of urgency lures further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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 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.hausbaumesse.at/ckfinder/userfiles/files/gegeniximuzuka.pdf In PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/kujur.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/18c75d636395e119fde11d28d440f2f6/sexejofanitedareko.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/bejogipixazusepulorana.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/78160553464.pdfIn PDF document text
    • https://limsurdua.com/contents//files/bigezalivavozebukax.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/97375650526.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/65078880661.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/p39r049hgpca771nq9i8ln2017/32246751188.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/vuteroziro.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5e78b1da---28863678008.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/92137310729.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e624ea2d3---84691632400.pdfIn PDF document text
    • https://anakmeong.com/contents//files/32588865058.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/74955847233.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f4d6ccf8386ce1b26183e359ffdcdab3/butoduzotufederip.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/86547496244.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/36206598300.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1a6bbbaeecaa78f58740571f7e3ffdaa/dobetan.pdfIn PDF document text
    • http://www.toptehnik.si/images/pexivariwurikiwunuxudepad.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1f96b3da---46605950636.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093c927abca1---48552901696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ms+sql+server+2016+tutorial+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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 18936 bytes
SHA-256: b087ef6806fbbe3f9cb2b92a7436017676197a6e5164bb2676e99d5a8dde136a
font_02_sfnt_off00013d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2E 11152 bytes
SHA-256: 6cc3dc903e25909a75ebda511c81ef79f1996a23b1bffd88f8c5aebcd72ddf29