Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c5df21e6e7f9e9…

MALICIOUS

PDF

81.6 KB Created: 2021-10-06 20:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ef1ed5780fd709b2667ac59c68b7313 SHA-1: cb3175faf947486951c2096c5357ede0de91daf3 SHA-256: f0c5df21e6e7f9e951bc6dfa7a173050ed429f0e14cdaf8750a0db3983b8eb1a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms and disposable domains. This suggests a phishing or malware distribution campaign, where users are lured to malicious sites by clicking on the links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=sprained+ac+joint+recovery PDF link annotation
    • http://industrialsupplies.pk/userfiles/files/92860288801.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b927172d59---lutowosubusutowu.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/36501676129.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/vibaj.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1f287747512f5467732bd089de041a5b/depazuzo.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6a0521314352b9593e52639da5167c5e/wepawo.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/91151808190.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/dutiwexaw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556d4418694---xibalodetewex.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/tikopabapivapupixixip.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/84762384414.pdfIn PDF document text
    • https://windscrm.net/files/file/gibeletu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c79e7bc383---66289964838.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/biposaz.pdfIn PDF document text
    • http://selidbe-beograd.info/files/7345390801.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zulodepufusoza.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/dedexokatawubigi.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/74628104783.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/61806054847.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5d094df02aefdf60a693939be8844c18/lipexoxutabojekotav.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/lapawaku.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/pezavonil.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/bovibanaxenikumetabiji.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/nebuxenugugezivuxufis.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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 10680 bytes
SHA-256: a444f6d80cc03c202d7a2ce5ccafdac5604c72e348a2b178595e76fb52ac6c44
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 18260 bytes
SHA-256: b1803f817169d3f6ab555a4f740cb7ce84bb64ae83d24ef2d9900c2eb54e5089
font_02_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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