Malicious PDF — malware analysis report

Static analysis result for SHA-256 69006d51a59499dc…

MALICIOUS

PDF

72.2 KB Created: 2021-08-23 09:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a170fe81fa12e3dde08ba6532201ca1 SHA-1: ddd5c378b5ef4e14d23d5c8b598d72f3658a2a09 SHA-256: 69006d51a59499dc0b3387fba64715e3876f90d95d392a656a5a6c3078c44717
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kubabus.cz/novy-web/upload/file/zalafowudewo.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2vdqis9kvrgjf78m3log0ukc54/91939196509.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c538bbc028c---35251528380.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa655f12073---71910937250.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/48b3f9ae3f74f8137e039d1c2bfa0fd6/wexupegedototukexu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/zodofazek.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/66666799251.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/29176430102.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/27760929744.pdfIn PDF document text
    • http://innotack.com/userfiles/files/57262740761.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1c212060ce43a59f2b4b1783c2deeca0/rixetetavewalinibile.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/71934039983.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ce3e7bec---navipifore.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/kiximakegavexedin.pdfIn PDF document text
    • https://airshow-bg.com/file/78570746786.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd841b0de5e---naxurudukujamoxemejagef.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/xutewezutujujepukiride.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/nizodeg.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/23157513428.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82113553631.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/tediwodalufijebarifo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b658bfb2b89---3743100204.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e80fbeec8120d446f61eadc99c38e993/25997114674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=leaves+from+the+vine+1+hourPDF 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_off0000ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA49 10608 bytes
SHA-256: e5d7997938e2254f5ebfe9286303584ec5b3b57633c3ba92ce5f65c5548da4d4
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 15852 bytes
SHA-256: 178d38819ce59e583ece323773e7f55cbee86980ee292092dcd7b680438a09b4

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