Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9f63e2e0af5fdd…

MALICIOUS

PDF

96.5 KB Created: 2021-07-18 21:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 772392cf3bd27a9956a50baa3db198e1 SHA-1: c152c0993ce596ece728821ecf4655eb29252293 SHA-256: bd9f63e2e0af5fdda421a5302adb826a069b588bddbc0c962af3ed3c63031643
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4461753ae69dc5122a41d3f052cd87e2/66641901938.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b7a9dcca6401db6ef3a0b5fae4920b68/28820435626.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gt7h73ic00bqfhgvs6nfck6fkm/zemumagalokatawunagi.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaba4c6316---29296550453.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/50ef19926a848cbef42ff13685db3f4e/10583696970.pdf
    • https://summit-christian-academy.net/scauserfiles/files/lezus.pdf
    • https://kudamatsu.org/userfiles/file/keselinobawudifelevirowu.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/897fc4c3c1c59f446e6b2ca4fd24f86c/13426444504.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/felirisaxos.pdf
    • https://asthasupermarket.com/userfiles/file/71665713836.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19f81c746---55095662288.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/47ac2af6019f20029ac3ee105c0f3a22/pimupidefepepikeko.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5c0a07515c09fe5e1ecd278defff3a08/17608226503.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0d6a2ec2---376482889.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/26758492256.pdf
    • https://tolgyesvolgy.hu/userfiles/file/vinudegidor.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/es4r7gjve446ihtagrp7ser47h/86894203789.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/97231314527.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/68824661064.pdf
    • https://toromecanicorodeo.com/files/57318459458.pdf
    • http://cayxaotamphan.net/userfiles/image/file/kemelujomikosenapu.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/5fb915dca60c1372e355fa7041b3205b/pegadupewetotedepuwizimi.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/41850bd185c528ef271076a431a4df80/41159285824.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd95b4fe9---kaxegeniviwikow.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/233fcf859dd23fab20951558438f6e99/pijivemuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=country+chicken+farming+shed
    • 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_off000114a7.bin
65743cfc6c7ab31ba5e5814e9599d04ffef13033c6b6c27bf35a51f63cd9f01b
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A7 17452 bytes
font_01_sfnt_off00014292.bin
0f457aa6240c22cafea93c6b9a6ee236b016d31b4ccd46f740a5181b97f1cacd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14292 11216 bytes
font_02_sfnt_off00015c8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8F 16792 bytes