Malicious PDF — malware analysis report

Static analysis result for SHA-256 9159468927d21e10…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 10:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a73efb733833f48de91841c0e51c942 SHA-1: 435ee97fb1e739bb7c3ddc114c6bf2f8fedcbdae SHA-256: 9159468927d21e10ca9984d19d9b1aa825470c26dc916ad646a7459aac7fbfe4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of numerous URLs, many hosted on compromised WordPress sites, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.bash.cl/media/file/vatufinejavetagazomul.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2b59e5661da7c456ea2d7d07334c46ad/sodapulo.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a2942f972625728cd43a7e287795edc2/nebugevedud.pdf
    • http://rooptex.com/uploads/2705731897.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608be304eb8d1---pitasewen.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f7267b3cd---99323685401.pdf
    • http://clubselectionvoyages.com/images/file/29869878411.pdf
    • http://geerhannutpourreussir.be/docs/upload/files/vibexeku.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5207feb557d219bb81a822385707aaad/50395273368.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/dbfc706a2f05e8a19a66a4ea7a4c8373/37336073732.pdf
    • http://www.awakohchang.com/image/upload/File/izujufaxedasajoto.pdf
    • https://kluchar.net/klucharnet/images/file/10046572848.pdf
    • http://anvlaw.com/userfiles/file/lusogatilogewoxul.pdf
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/zagixafuruwekaxe.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3f296d868e8bcb8b9c6a4c175adb0817/82219335887.pdf
    • http://hms31.ru/img/file/19180683618.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7af0e41d---zuwokivizewi.pdf
    • http://geoass.eu/userfiles/files/zuxekoxevedopa.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c747e381dfc---60295371043.pdf
    • http://artecgroupservices.com/imagenes/file/riribekejubedekar.pdf
    • http://hersheyhigh1981.com/clients/37302/File/60212403137.pdf
    • http://giustizianuova.it/userfiles/file/31338395253.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8097fb668cce5d2029649d439ab79db6/66715172864.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sony+a7s+ii+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5fe.bin
fa606e1ab5d8ca43660d282975b9354e53c43104c34cfb1d5174916fe0b6dea2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FE 10276 bytes
font_01_sfnt_off0000cd1d.bin
4cda7309d13ae55ade7aeb5d38ac71348702d73e45f3d2c98f661fd8eaf4d58e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1D 21056 bytes
font_02_sfnt_off000101ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes