Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83d3382492fc901…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 02:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ffe236de0c169bec94b226453d9932c SHA-1: 056beb8fbb172cef3c4331cfa303146abb97f89e SHA-256: f83d3382492fc901f73459392f4d416ab148d3d9fb0c94efa2ca37a0ccce47bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to potentially compromised websites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://rmduncanrealty.com/userfiles/files/65091276155.pdf
    • http://reckdance.pl/userfiles/file/domufefuzot.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392fe6d7081---miwekitukafutirol.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315680ddc9d---befevajodenenadogeluxazu.pdf
    • https://paeonia.ch/userfiles/files/84861412721.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/wubelajomedofibugawufux.pdf
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/kunulubep.pdf
    • https://ev-owners.jp/userfiles/files/71686203513.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/padakubemek.pdf
    • http://evevoyance.fr/adh/.-/file/40844651386.pdf
    • http://email-database.info/userfiles/file/fizabet.pdf
    • http://elma-itc.ru/!upload/files/1556192583.pdf
    • https://bacsionline.net/userfiles/file/fetijoziperusokiduxosu.pdf
    • http://nikkenj.com/userfiles/file/fixoma.pdf
    • http://simkoongschool.com/uploads/editer/files/15698594753.pdf
    • http://naphotelbangkok.com/userfiles/files/zomowuzezetivesivunikugal.pdf
    • http://kd-council.com/upfile/files/xibuveguti.pdf
    • http://wsm.hk/images/files/mopulotid.pdf
    • http://giacongcomposite.com/upload/ck/files/nanomufog.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6c9a02ff6.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xofirodelorukitutawiru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=adobe+photoshop+cs6+full+activated
    • 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_off0000de99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 16792 bytes
font_01_sfnt_off0000f6ab.bin
a497836daddd0ee90ab8d6812363a0eee37e8792fc5eb35255510fff534f92ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 16716 bytes
font_02_sfnt_off000121b9.bin
4b425923fc24c5428cfbf07216205ae59b47caf7be8991596cdadde9eab35fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 10968 bytes

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