Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6cd5d247bbe6ee8…

MALICIOUS

PDF

84.0 KB Created: 2021-08-28 18:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fc7c3494fec39fe67961ee0781cc5e0 SHA-1: 51b9ef98eb2970f606a53f023636fd23bf21cca8 SHA-256: e6cd5d247bbe6ee8ee5eea5075fbcfa839d5ca44cf6ea8b76604594619aa78a4
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, hosting numerous URLs on potentially disposable or compromised domains, designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a malicious intent to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://www.petercar0937494634.com/upload/img/files/92495324407.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/415526c3c6c9c900aaa6aecf82aca9fd/lawovezulotef.pdf
    • http://scarpatti.com/files/gevitatefirar.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea785aa28d---gotasuwom.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c728ff2dbc9---retemedebekuxexodutuzug.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/povikefapomi.pdf
    • http://ngocvietbungalow.com/upload/files/40041963840.pdf
    • http://renovator.cz/files/file/91464136744.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cca03a96f1f---18258608249.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210725014646.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072da6f74550---jepufonugifula.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/jujuvizesu.pdf
    • http://oikoscoccatoarchitettura.com/userfiles/files/93836017242.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/36322122106.pdf
    • http://chamdure.com/DATA/files/zemusomugeduxirikapini.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=toad+for+sql+server+portable
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c270.bin
a8b9560024f3fe87083fde4ca276c0db2946399d689d2765e4b3441314d992f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 21852 bytes
font_01_sfnt_off0000fb47.bin
2de2f02f231793b21dad80b6a81c4a0de3097e4d3b71ede9b956172866c02e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 10612 bytes
font_02_sfnt_off00011341.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11341 16232 bytes
font_03_sfnt_off0001291a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 16792 bytes

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