Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eeb1df6d56717c…

MALICIOUS

PDF

81.7 KB Created: 2021-10-13 23:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a2f4d1e8ebada6ea22f0dcc8c6f6cb1 SHA-1: 657bd496f05240416f30c3f3c1d11a508236b5b1 SHA-256: d5eeb1df6d56717cce1751ba72fe4a8c89a0a0f837305c81dc2ef27a900d7d4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on such sites, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=tell+me+about+yourself+answer+without+experience PDF link annotation
    • https://o-dance.com/upload/files/lisekuwimabeta.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/lizuxezos.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/6627569134.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4a89bf241c8b496a8f92fbf46007cedf/fejetevabajozamozox.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/pikatokewodibetipaj.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428560a80f1---denewirisatorilidofuf.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219131553113621.pdfIn PDF document text
    • https://estoniapools.com/contents/files/wemazotevomi.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jukuxib.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/10931818934.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/xotogeraxivifasipofufej.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6134b1233ce14.pdfIn PDF document text
    • https://cmf8.ir/data/file/lajogavuvoguzepar.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/xewefowagomonogobesite.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/mujuxarezagixafusuf.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0990c3b6c6946d09c4c62363f22c9f2b/rezadepameriwawefuxutawet.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cdf89bd481396ed6da83118a0968779d/59805091607.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21947004677.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/56955259291.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307934b2f4d---49596478597.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/55888950524.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/worilamigirapax.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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 18624 bytes
SHA-256: ff6aa6a2b661cbae6f6ce0debbc0ac7c0af3e1432b6ed361c6eda0365bb4f36c
font_01_sfnt_off000106ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 11252 bytes
SHA-256: a041ff2a3d8551c7e16fdec6cc1c494654013b74c37844d5fafb0e4d25b18102

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