Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5db1a9acf48b5a…

MALICIOUS

PDF

69.1 KB Created: 2021-05-28 12:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e3860df531b368a9cb22acf118b483 SHA-1: ed1c1981dc1a20cf06bc404e3a4053e0a30bd32f SHA-256: fc5db1a9acf48b5a30cacca96e1cb77880bc2a38a4ef545034b06868510c7f65
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic firings for link farms and compromised CMS uploads support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c06f9df3d1---71977828680.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098721f29c5d---dagirev.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sldf6msn169r3vq223f9u9q410/gilatedije.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d06c3c10d51d9bbf65fdab953fc6304d/72888846946.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb1983449---35956763265.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f728b0b2a---gugepozezajabinuk.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/79132877549.pdf
    • http://placc.info/up_image/xisajafitukow.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/015d258fbdeeff9b1603f6e1e6333ddc/11134450592.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081af8100210---20178547046.pdf
    • https://xo-sound.ru/userfiles/file/34071864899.pdf
    • http://poltinik.ru/userfiles/file/90219410223.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/80be81be4ef866ea42059404eafd27bf/wujugibarixosidina.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072eede63f35---wijepuzowotobevu.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0ro043i2qocd5469b704c0nv8j/67143952108.pdf
    • https://palcev.ru/userfiles/file/21533142592.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+auto+click+on+roblox+mobile
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35f.bin
b8cdfdf5779a2997e9f46a06e156a2dc580fd779c78db0e782579fb8c8a7ced6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 5332 bytes
font_01_sfnt_off0000e58a.bin
61dfa80c16648900b76921513b4bc36289ce73ea51be1da2fac949de0af96324		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10004 bytes

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