Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e925539e00c4f4…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 20:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84615319aa279cd5688fbfe7bdca7d0d SHA-1: efb5a25bbef88d9f682364b16224e0eca280d61b SHA-256: c1e925539e00c4f4197a9d4723fdfed19ee467420f0c53ea69ba2d2795887e73
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to various compromised websites and disposable hosting domains. The document's content, though heavily obfuscated, suggests a callback phishing lure, prompting users to call a number in a context of billing or security issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=icar+soil+science+book+pdf PDF link annotation
    • https://diedacorporation.net/freesiafiles/file/6910729540.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/r781fagck45bu7ca3idsr7suo2/53210528967.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/41264046339.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126a171bb695---56606688203.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a08038e36ea688817eba9f42ab9e53ea/555595847.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/ranazejekegipufozewo.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilemud.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/lerum.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/84940371965.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3gh309l06njk1viald7lpln606/rebatinus.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f8200d7af7df84cf9d9de49178946e21/derukuxawilaloxek.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/22/file/20210622_201922_178.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kotijufokuwisegox.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/61d96a77a31b5081d8932a4ee4631875/rexuzozaxeripixakavinox.pdfIn PDF document text
    • http://abworder.com/uploads/files/julojuzavenob.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/baluda.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/4kfmhcd5gpd8nkpb1g4i0s1dhm/22577300874.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/45005995572.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/8284214490.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/82352881700.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/61969060010.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_off0000b553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB553 17604 bytes
SHA-256: 1cc2e08902a3104a351b420958a3f7836f59f91d0b0d3b1d1a69dbd3cb8d5899
font_01_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10696 bytes
SHA-256: c6bec5e6c461166de89004c0e76510726f1cde7e246653d3afb8743a817b33c1

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