Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b336e9c53400e5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 23:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f367e28a16ecc2c2db3fd3c755379da SHA-1: 927718bbbb4a9d10a815af9f443084ff3556a350 SHA-256: 92b336e9c53400e55479211279aeb82565470561d87201ad28366fba89f6e21c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of random and compromised CMS upload links. The document body is unreadable, but the numerous external links, many pointing to compromised WordPress sites, strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the nature of the links implies a potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • 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://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/de90af2346af618b9c5b78ef297e561d/58761083598.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b8e23ad1f818867127146f1504199a34/garoxozog.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ca32140b9---waseguxivevituxowidaz.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/7538525550.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/3d19970bdeb32e3e6ac96f5ead493117/39756281946.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373b337df9---kekage.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f7245d589ab581712e51f89dfa043f36/38848514325.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9fdd65e04---94062046092.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/80546775514.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b854b833---sigoxumikajidigazomuz.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/zelisoguna.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607433899adec---18080987413.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/91255795383.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/62864864149.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/fonogaweruxodefagop.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/74808452383.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/e2f3032e6c4d1cce5aff74dbb10a1930/werejunifixi.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/nedeg.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/wavijum.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7a681ba46---35030122660.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e726ffbda69b0ac31e6213752fbb8a0a/ganemomaworejijaxoxonom.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/sozenuparalibuj.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/91837597073.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/nolojinog.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fad68df34---balivanabuwozetinipozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pendekatan+studi+kasus+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 10420 bytes
SHA-256: a63303253fec17b0a630696ef03ec7c36eb3a2cbe83f8d7f8c171d79cb09c4b9
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 16524 bytes
SHA-256: 3cc530b17fbe9edfc037a1f60b8a77f78450e35479961192d686457c1f18c4b1
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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