Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecdc8e5879aab9c…

MALICIOUS

PDF

94.9 KB Created: 2021-09-03 23:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b4c99c0a56f273a02e90429da50d574 SHA-1: e400439a9db07532b65dd1ea06bb08576aa103ec SHA-256: 3ecdc8e5879aab9c1d2ea213fa04309f409499f9bf82deaded517935477910ff
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded URLs point towards exploitation of PDF vulnerabilities or social engineering tactics to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://laborke.ru/uplcv?utm_term=social+cognitive+theory+of+self-regulation+pdf PDF link annotation
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9e90d9bd---poruj.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/55669319468.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/97050734140.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bb2a769230863db342ece283283e8acf/didigowidimarolojube.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb564577ff---kotaj.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c095eef6207ef3da4c500e4665409aa0/98173169746.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/5840152549.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/56027046370.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/36110905161.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee93d6d5ba8---66429182130.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/vifenag.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609313a853a3d---46122463438.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6023f04077f386195a4f5437e819fab2/sidunalukijelija.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/suvuzokedawa.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a5083c03f76b41067f0b59c96eb3292a/15599135175.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/27042116179.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/387b6fae2c804cf5872a2ecda7f6fd31/gabuzinemavefivifelatoj.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5mi38g4pt1ge63vlff6rm3cu64/gowelam.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/viraw.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b306d6e81a3---47045547598.pdfIn PDF document text
    • http://dothi.info/images/files/78558551711.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/fexakerik.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/gamivedus.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lepapu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9e4c7a4fa3b9a8bdd020c9d847d32fec/xamikabusu.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/wuvesofusujusak.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 11288 bytes
SHA-256: bf95a0d8be9991ede0cf065cdf4dd9fc36af2c411c9de377ac3c7c4f5c3379fe
font_01_sfnt_off00012448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5A 18788 bytes
SHA-256: 42c77fa979077abad2abd379784d19dc8d867b83ca30739dfff6292561b47367

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