Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1953646968b75a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 12:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35849994e57013397e419173f06bc549 SHA-1: 302c9381d0713f0692ccb6f63dc275d864376a58 SHA-256: 4d1953646968b75a1ac14c1e675074d8c8deb46c82637d14840ac5189405af91
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The document body is unreadable, but the heuristics and URL analysis strongly indicate a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608decbf86c98---vafarimetilufesefami.pdf In PDF document text
    • http://knshzj.com/CKEdit/upload/files/21984128699.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/86770055877.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/nafeb.pdfIn PDF document text
    • http://melvin.cz/data/76313445909.pdfIn PDF document text
    • http://askort.pl/Upload/file/gimesijafup.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430063307998896.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/11702631678.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dojasalapesigaturuvu.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/867373252.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/rejisopekigoresiz.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/folal.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a406b73569---wajeduromovu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/78388733174.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sl7jq094vpl5j1ma3ek0q87k8q/vujonikuzak.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/wibewugemukovugotorir.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086d14922b0d---jujow.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/204a6a5c7876a9e39105104cf9fe7950/kepes.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/25074676403.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba7a33910---14034929254.pdfIn PDF document text
    • https://bdcomunicazione.it/file/tebazopolifedilokafopiwi.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fnhspurqmc1hb5k71mj3ogrbnf/xisuze.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/91707268173.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/fdssr4f5da89qurg5hrjlraj1s/50622802968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tale+of+two+cities+analysis+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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 18004 bytes
SHA-256: 001c5c4b50eee168bba64dba3e3704137a2eca95673f3e21c1bf63142e41c090
font_01_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 10676 bytes
SHA-256: 6e880840404ba1fc38b9f287e0786dfa10909eacd3c58b8464d2420250ef6eb0
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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