Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae996a85bebd2f30…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 17:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 706edce1e004819d59fb889c695fbd3f SHA-1: bcf3a81cec6c255f806cb1c58ecef81d3d07762a SHA-256: ae996a85bebd2f3093072bbe4d5dafc27196e9b82a6e06ae72c6cef54a52b564
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=usb+tethering+not+active PDF link annotation
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/82dc02624726b6bbafb700d451cbd0aa/76892267585.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613592470d7d3---24086726355.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/nibogumuwokeribosajubezas.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/wonejake.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/45335160788.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613352141092b---39945313414.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/62413933303.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/jomegafezawefawudivop.pdfIn PDF document text
    • http://denge.aero/upload/files/98533447641.pdfIn PDF document text
    • https://hoavily.com/uploads/files/82957240069.pdfIn PDF document text
    • https://dukupahit.com/contents/files/58438056187.pdfIn PDF document text
    • http://uhorder.com/upload/files/zanin.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d3c5a4bcac0f100d4948eea36f7a71ff/tumop.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/73111959406.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161409ba4ed7c7---26149456540.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/88341056061.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/pabutiguzazogekajifoz.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/17266265991.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/juxuvesanepuxerepufi.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/ropajekumoxu.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/38783981430.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/zapotulukujorig.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/67445396587.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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 10676 bytes
SHA-256: f9b4d9ee75468464cf0cc41fcbcc71b52f75e6c0f70e4383f434e833d5d87754
font_01_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 17972 bytes
SHA-256: 609e329bbde160f3f07c6c8b082918aaa0bb2f90151b0221e36e2b82c06fab1e

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