Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cebe48d20de3703…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 11:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5689dbb3634f355c3c98636aa06b8aed SHA-1: bf80cf9ae6377dc3417a7205bb43aca87267d34c SHA-256: 3cebe48d20de370310f48b14715a1e8c5793f66ed6b1c61c566bf9cd1f03c568
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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 delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://camberwelltaxi.com/survey/userfiles/files/wisej.pdf In PDF document text
    • http://solamsys.com/userData/board/file/fuwukebosabivedowimig.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/luec6dvo770mk361qmq7vev0nb/14080780643.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/24545196245.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3c81cce3dca09ab4beece121270d73f6/96034742063.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/44202322069.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/93119977680.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/k879l0kj19ij58sgb79ku2ipdi/dujolawutibikel.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f7r27htalpf3esbhbg4om2rmmq/25258339050.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/duxivilulavizivuxa.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/napusitawofifagexa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d35157f5d1---64949438119.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rariwodumiwil.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/k7f23eevi8n19khbmgcaf1ttqg/manikuvojepemot.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/33126840671.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/moripuwoxizajel.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/65935156495.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/86498472711.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/19787928764.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/mizepagofalezuwezum.pdfIn PDF document text
    • https://xigmatek.com/upload/files/zuzujewuwidisagokoxilenud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ruang+lingkup+etika+komunikasi+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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 16636 bytes
SHA-256: 618b71cc27086af1dc3be5eddf51154e602e919769a7e649e36ef23e2bad7a31
font_01_sfnt_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 10980 bytes
SHA-256: 771448e71827b5d27f2f7bf82aa2547609620a8d3bbc775d953902a0fe7d8115