Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c3673acff3046…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 21:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49cdb00427d2bb5d33028fc001ea2937 SHA-1: 77f4ef56e3eb22259b88cb324763fa10a72300e0 SHA-256: 856c3673acff3046e8c83cb0e8d99908ed497535509fe21fd08e018703a357a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medicom.pl/userfiles/file/zunewubozovemivawivego.pdf In PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/wajozopoti.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094743a50012---kosurukavalivat.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3ca1849786c16cc9d15e1ecd61267b49/mipemogixug.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vowaburegibegusujixinakix.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0a252914b---noriwoxiw.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/numefojamabil.pdfIn PDF document text
    • http://aven.su/userfiles/file/65879461348.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/10061181833.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/47963593771.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/kojupigonatago.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/k62tvhn6e662arkdnee5j3chhd/kolanelawakipikeveluxo.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/likepifatewove.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/wivuk.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b57a52bf8---47098609729.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/16819503798.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/furgeiauhnnmg5j2brafftdfcd/43334758666.pdfIn PDF document text
    • https://ijpdua.com/contents/files/ziwujimorekepirutodaromu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210712_ABCE1CC370AF6DAA.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/boden.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/boduvigubeso.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/46678748790.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/mokodewev.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/zetinorekemapeziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wacker+neuson+38z3+service+manualPDF 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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 19564 bytes
SHA-256: b2751d5afdf392f676a40ad5d628a222a48186d36aae13549835c0c86237ce92
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 10984 bytes
SHA-256: 52d14ccb92217f570c7baeb066c573ecdd7614fca25ef9a08c7378cd647b421d

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