Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f812fbde97d61c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 03:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d4881dfd507229c6e8917e868862269 SHA-1: 493158655fff4c47a4d5e4307dbf07851a03350c SHA-256: 68f812fbde97d61c5dee1e2dc50202d3906a35bafe27fda16486402848c95ddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=cast+from+android+phone+to+laptop PDF link annotation
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8a33c7184bfd4e695e6e4d95002d7f58/xijofobololebesojosaxin.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/sibaf.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/27497395046.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/45784099396.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/88235479773.pdfIn PDF document text
    • https://techlan.pl/files/file/kimiluraxamare.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/tepejolule.pdfIn PDF document text
    • http://allycatering.com/userfiles/13548310747.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/11602238645.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/vixinugebemovudar.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/4111079970.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/87379956725.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cadee6058---ravivelarenorowa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rojupum.pdfIn PDF document text
    • http://shahgrp.com/uploads/tikin.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/vepixibo.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/60107671865.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepozipawox.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/mebavimonoremokewowupuz.pdfIn PDF document text
    • https://areicon.com/images/file/tatuwewovukewezaju.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/pemitujamune.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ac4d9ce0---74527681003.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/19cd22e7f55fd5a2f5cf0b5e24e93115/nemumota.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/nujojuruwemilobup.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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10792 bytes
SHA-256: a3eea471a81de2f22c308eb7aeaae5dc6cee2e9bc8ec1dd458b1ee25627f1539
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 17620 bytes
SHA-256: 90b81a6678ee78faa1847a004b926a00ece61341d14ac415dbcf34332b111c0a
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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