Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fbca8446f19804…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 01:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62b35037c0e4e52323a750799483c6db SHA-1: 83e1413b0103a0275d5acd12298baf33ce8b1eb3 SHA-256: c3fbca8446f19804bdb8a0463c50d0a5591f2e7204c761bc599f937ff21bd548
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a malicious intent to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=conjuring+3+online+film PDF link annotation
    • http://aldo-ins.com/userfiles/file/gogiguwazetu.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wesomolejilukafoporonip.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16143fdf352309---82692315719.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/xojezegimoropajenojaso.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/24/86326660710.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/90900445496.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/4762840373.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161435b4de12bf---duroporokepopadinuxuvi.pdfIn PDF document text
    • https://simorgh.it/uploads/file/65667511324.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/futesome.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/81748698832.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezofijefibubokowazul.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/51827388693.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c1b1b51ce---72193514331.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/votufox.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/30311761434.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/13606693839.pdfIn PDF document text
    • https://stauber.lt/images/files/natoropikunuxotureturiz.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/tojusebetubefamagifovado.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/72008459186.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bedcf66f33---80375010166.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/1921837015.pdfIn PDF document text
    • https://coluer.ir/documents/file/81988304126.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/xonaruw.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/mezuvapelon.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_off0000b542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB542 10560 bytes
SHA-256: b87e15cec7b570c0e838b28f81a4448cd9adbf04ddd8aba1ac3bb4a576c6b681
font_01_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 16052 bytes
SHA-256: 38162f183eda4ad322fb65b08b043f15111f6e35069ca48238ba3b9503f1291e
font_02_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1