Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a41c8e0d4d6c164…

MALICIOUS

PDF

89.5 KB Created: 2021-08-03 16:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82cd88618d3cfc8ddb108c80978b2f9e SHA-1: c277f156591243e26cc983f39ab50fd0b06651fe SHA-256: 5a41c8e0d4d6c164d0e08a0cce684ac928fd824ff66bf06cb5e29d17397f5897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs and link farms points towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15dd76b52---duwowiguxanimikipofogus.pdf
    • https://cengilli.com/icerik_images/file/47124855225.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/13e0dfc48b38376118e675583999f7cd/28789750822.pdf
    • https://fokusmedia.com/images/uploads/mefot.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/17aec3b901bbaf17d24f68ec968f760c/12536581976.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bb85af4db78b3941b02b20bb4285d261/vonufazivi.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/2314980757.pdf
    • http://autofox.lt/ckfinder/userfiles/files/xovobutozi.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fd2ee663---51325097516.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e471a556e---selizasu.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c82e58d3244717d2b44cdf3654f79b2a/merulikagala.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab113ad39c---95911381754.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a52a6bda8---54541517475.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6de210fc4---68709827043.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfu0mfq0or2o50mkns7f2oguh0/38011703862.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610860b50d45b---gewekekonugaleruwu.pdf
    • http://uceng.net/_UploadFile/Images/file/32235009946.pdf
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/zutowinidazebof.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d5104e3320a81aa8577de4cd41bfdf5a/naniguziwevidexefizu.pdf
    • http://belgium-ex.com/images/blog//file/texofadorarupe.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/809d05d2535546e2aadf514028c2cfeb/kivaxat.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/pomobomawasenitewini.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bcb95d541---kukasepawuvabupebof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+to+do+after+installing+ryzen+5+3600
    • 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_off0000f56f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes
font_01_sfnt_off00010d81.bin
9e0daeb9614afe608f37bd3ded95da7eb51e592216a7354b03e2e0f16d5d027d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 17368 bytes
font_02_sfnt_off00013afc.bin
385ff9026cb0690e80d6af0f8223e2c0e4a5347de0e0cfb343537082d556874d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFC 11396 bytes

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