Malicious PDF — malware analysis report

Static analysis result for SHA-256 a400838dbb36ff8e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 15:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65c873dc0f5191b3fca62d92fc2b859a SHA-1: abff8051a0a291b61a3dd5ec47838899d26c4c9c SHA-256: a400838dbb36ff8e9e1ce47730b52c3141ead520c97cbab0be7a6aa460aca8e8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://avukatwebsitesi.kocgrafik.net/upload/files/39374938064.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130029a8d4ba---jugetinapobozixifimabel.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4ce8c585---wajeralad.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/44029940996.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/mewilewumeko.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-8/20210908205122591442.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/turutixikelu.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/melaguxamilevivagoniri.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910220252404020.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613650aece78d---2439950713.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/45206646011.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/72910769286.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/6895643526.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/92290697032.pdfIn PDF document text
    • http://reylab.com/userfiles/file/befeligajozulagofo.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42625146046.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/93896018360.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/52652032218.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/ojdgslq70303klibqgglfltnr1/94426267026.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/48871636981.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/11915505781.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/monimixavolu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/51535681663.pdfIn PDF document text
    • http://upakuika.com/img/file/15676633377.pdfIn PDF document text
    • https://edgecs.com/documents/50787238998.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/35830312274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+extraordinary+cases+of+sherlock+holmes+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_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 11156 bytes
SHA-256: ad1c1df080883c252b9e62ae2ecfdae576b582421ce95408daa3e1b2a7b301ba
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 19400 bytes
SHA-256: 4ad53c3d98e4c7a4dd3aba1f3d5d3a4cc4af6abd1195fd0fa14b88f7cf6f1773
font_02_sfnt_off00012ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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