Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfc8b296bec89e7…

MALICIOUS

PDF

67.3 KB Created: 2021-09-27 09:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 344ab47010a5c855d97aaea1372eb4d7 SHA-1: c20dcd06ded078a53420caa41e7d76cd3f547e42 SHA-256: abfc8b296bec89e7f4480a3e292a9d55ef78b8919ecf486555e9646ebdc96715
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF employs a common phishing lure by presenting itself as an image, encouraging users to click embedded links. Multiple heuristics indicate this is a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=messenger+for+android PDF link annotation
    • https://osikovo.eu/webroot/img/content/files/54310955373.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492009e3bdf---waxurodujepogonibomuk.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/domijofotusijabo.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/15314067016.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/vupoxufimifiriwiwopanemu.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/17038260988.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/joredugerozuwidudub.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/zelivusolemozageseji.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6c9aa02cc9cbb4ff02ef584df0ef9e56/sijezuxowulesu.pdfIn PDF document text
    • https://phukienbep.net/media/files/finedi.pdfIn PDF document text
    • http://iccarrentals.com/files/file/xiweresogoke.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f07b89eb---94224106231.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/kepurajit.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/18368408159.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gg2687jgs3ogl7p3ejef7172u2/gifuduxi.pdfIn PDF document text
    • http://hibertek.com/image/files/20210922_130714.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/nadewizafaku.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/905c69201626dc6ecf8458cd8f9c7e19/1887337475.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/xaripavo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/5453057490.pdfIn PDF document text
    • http://huarong-bio.com/upload/files/48433996995.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_off0000ac4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4B 10376 bytes
SHA-256: e6cedb986d9a4b05112f41bff4681bb0df6e2244aff649f03e032802771e6c21
font_01_sfnt_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 14476 bytes
SHA-256: d91af4463bac7de03e1d221faef1133a5268a712bdde14497ff461f7dc8d1abe
font_02_sfnt_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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