Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4a34e1150f5a3e…

MALICIOUS

PDF

84.3 KB Created: 2021-06-25 16:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c3036c557d3a94252bd8b5d6d25f1b2 SHA-1: 84f34602dc2282e0cecff80c9304ea3e27657597 SHA-256: 4c4a34e1150f5a3e27da5071c72ab548535338fbdbd6a3439be3bc6fa2ec3f94
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 a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL analysis point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfdbc17e5---wizolopatoto.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b1a59124---53728744111.pdf
    • http://nappsa.org/userfiles/file/xiwinotetamovufozip.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/dnd9ds83irr3e6mdqralumorl7/nowobidudokalarefin.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096cc2b91bfd---3291990726.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/781182c1abf5a03f633681abd9ca5823/2468789379.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608238d34e965---vurosopoxenig.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7d425acb5ba4c231619153edbb7b4732/22161824599.pdf
    • https://smsenerji.com/resimler/files/64752537760.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092401ad1b0b---lazapavuroxuxapes.pdf
    • http://kopdesign.nl/userfiles/file/69602795636.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/bee1tutbc8215mp9glquj4vup3/80107933304.pdf
    • https://burgaseguros.com/userfiles/file/supinusolujegojitunanal.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16084d058044ff---puledoxunokituf.pdf
    • https://fokusmedia.com/images/uploads/gukawimuvatorov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=baby+marmoset+for+sale+near+me
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad2.bin
1bf0f83ad035a5d46bee72c04463aef970d4c10c11b79b423bc80baf9d441893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 10588 bytes
font_01_sfnt_off0000f310.bin
f6a9165ff81fcac992ebfa574775dc691d9a294a62bbcabde252cb460826c8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 2252 bytes
font_02_sfnt_off0000fd0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 16792 bytes
font_03_sfnt_off0001151f.bin
7c612a58a8965d84f338a27e5b05a77d9890bb65507d83b929bb729195020eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 18004 bytes

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