Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0c0bfa57717f35…

MALICIOUS

PDF

87.9 KB Created: 2021-08-26 12:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83067462075e79e62f3b346049700ce4 SHA-1: 10da054288cd0d6889bac5d47bed5de5e33768ba SHA-256: 4d0c0bfa57717f35c107313164887c24e8ef07932a6df37a29f63115d29a3a6a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/ziligevubif.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e3daae412---10815990744.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b612a3c2569ad397f0602e413a8a3f53/49727133062.pdf
    • http://anhbanglaw.com/userfiles/file/tajoxajezituxeruwi.pdf
    • http://police8coop.com/UserFiles/file/16019866894.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/fmfr4r8jcfd13m2plmhdele3k0/wikemozigodir.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/fatibivatoxofipem.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ace4589d1---24902107964.pdf
    • http://littlepearlbooks.in/data/eimages/file/jamamipugatalomumofosiru.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/5cff024fd18588f78900cfa3170f0610/78772383158.pdf
    • http://mp-journal.com/media/file/newutasuxebinabo.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/23066802027.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ectuohm2rl6cattp223e6nfa47/779304272.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/99536069962.pdf
    • http://skrabl.pl/www/rpbd/fck/file/21074024562.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/kobekusekuzabuwefij.pdf
    • https://mclandpin.com/calisma2/files/uploads/70360528340.pdf
    • http://coachhouse.info/assets/file/jigeso.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608827fb3e435---jidoxasiluxelaku.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f14cbbda6---goxigezanedigijefigow.pdf
    • http://pinxedien.net/upload/files/45588951170.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210701204438.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=proverbs+related+to+cleanliness
    • 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_off0000f268.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 16792 bytes
font_01_sfnt_off00010a7f.bin
17d8cd225c2f1ea64a45ebfc4e2515bac49dec8c20401adc0f2e6680f5b82c10
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 10572 bytes
font_02_sfnt_off000122c1.bin
80c89bfbf9a4af682de6164c2fdf61be6afdee4e1247d7610f7748e30f438028
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 17144 bytes