Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8f4f0209c30e40…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 05:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5048d0a5960738865b1a95ef8455f5ba SHA-1: a99da59dd514a6f7a780459c33f86a0b66562a05 SHA-256: 6c8f4f0209c30e40f3c67292eb4e0883a544459784226e3ea7000bcaaeaa12a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of external URIs and link farm heuristics strongly suggests this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=apa+citation+of+pictures+in+powerpoint PDF link annotation
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16086f995a154c---jerof.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607794bd6cadf---xivavabafulumafatinaseko.pdfIn PDF document text
    • https://lecachet.fr/docs/files/36914655526.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aa81a6d360c555fcb58dd537bb223164/46336379484.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/70085581344.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c05952db4eb---79502954287.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/paxeduxagaforu.pdfIn PDF document text
    • http://abwessex.com/uploads/files/moruxejukarotisokora.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf90c61341---lamiponala.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/46177455927.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160f51f5d43855---dalaxedafexatuw.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d4e0d23973ceca22dd6ae1bde448b610/55995008493.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5mm279vsh0ng54vsv3j2a58ufj/5901424031.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/wotakesi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16093399737c74---siwiv.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/puvanaxu.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/99012250947.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/32187248859.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f10d1be4---89657473010.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/gavef.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/lupedumoto.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/jr9bodsbuc0oh3595fsgjf9ir5/53420326598.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/39960460119.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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 17564 bytes
SHA-256: f97fdddf94c81eb002af031e15056d10519587bd62c9c89014036b4d9dcb661d
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 10596 bytes
SHA-256: 7afc72b33b1c79f36dd0bf2f4109c78de480c00827bbd1beb49a68ff74bac46a
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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