Malicious PDF — malware analysis report

Static analysis result for SHA-256 85710b7e3699b933…

MALICIOUS

PDF

90.4 KB Created: 2021-06-26 11:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12e48e112fc86d8a1ef612a80f0d7049 SHA-1: b08f0999f0f1b18e5447f1a2f90c42a9cedecd8a SHA-256: 85710b7e3699b933dfa7cef4f61df79eadf938685e14882b0007e73efb21a8f8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The file's structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b211285ce60---talamuluporopo.pdf
    • https://ludifrance.fr/userfiles/file/sivovuxijazujog.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/160e9c4947beeac5d5b5adb8334b6f16/kejodisi.pdf
    • http://forter.vn/hinhanh/file/15228785288.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9a0bb623c---lewikugubivuwuxeneg.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/d2sudiue4mn9h97nu9o15curpl/2447084598.pdf
    • http://myjobcareer.net/userfiles/file/2021060520493573499.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9ffacf95---kelenoxizovudusilaxi.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/05fd3b7c82e793921b7a7b7c886ea022/kibawupafebujozulu.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/da13gqotg2scbelj5k4qbfp3qe/madawon.pdf
    • http://cokhixnktientien.com/Images_upload/files/witulepeje.pdf
    • http://ceresasrl.it/userfiles/files/dagozew.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160caed7aa773d---58702622865.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/73272482712.pdf
    • http://imi.vc/upload/files/fowedebavin.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609854d1896d1---28975291228.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/925818330b2b9cdb4c20e8f0d57686a7/jagoxo.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096c42d5321f---89159631129.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/m5ol5kb2287592533be3aqcmb2/gezeko.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcd2afbbf---sariroxurej.pdf
    • http://tanriovermensucat.com/uploads/genel/files/90674706569.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/354815762923d6937df9af9ffa359d00/72492693169.pdf
    • http://ghalemdi.com/userfiles/file/xodimarefapotifodogubu.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed019de389---61568025092.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/i19b01hp6jihojov6mk2bohel0/moladatiligatukofuru.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=poor+man%27s+lasagna+with+cream+cheese
    • 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_off0000fbbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 16792 bytes
font_01_sfnt_off000113cf.bin
3563291d62335b58fd792561d98fd473331b59dc2e3a8c04338aa558bfacc1df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 17616 bytes
font_02_sfnt_off00014192.bin
f69ba9f9f57277868b76d84e6db09e2e43f75b0d0679c7d9df042005c7f29623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 10800 bytes

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