Malicious PDF — malware analysis report

Static analysis result for SHA-256 93faec13c98ae36b…

MALICIOUS

PDF

93.6 KB Created: 2021-07-20 23:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eaa9f9fdb14861b09f82770728894ea2 SHA-1: c9466bd01761f326a832fb58b687d3101bbb1d08 SHA-256: 93faec13c98ae36be902ec035124e05e46cc7b22476c1dbd4e1dbe40a3b6369f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://alpanelektrik.com/depo/sayfaresim/file/vosipekivapororakog.pdf In PDF document text
    • http://www.puhito.hu/uploads/sudufomarifurovirur.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/60432730255.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6301c7c965ebe33c42de97e41f9874c7/88413643177.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/fe9u73npdvvrusga7vvanaspb4/kiwivoja.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/xebapolilabumij.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc089744eb---90819342652.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/43fb5c9fe3d2b4cb4d846f501963c8f9/79327914231.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonozixasiwugo.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://www.movementmedicineassociation.org/ckfinder/userfiles/files/53516659227.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608404ce0dcac---80711674492.pdfIn PDF document text
    • https://patc.fr/imagesfile/kenujuvixubobizu.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0d4fb9740e06b8a05a2d64b05916f0a8/wipiviviro.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7800375ea133b4596d8e58f79eee9e19/10967277819.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a8795bfd---83496983913.pdfIn PDF document text
    • http://keacg.com/upload/files/sirugugose.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/wunigev.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/22272640499.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/zobunibewagavotapiremafu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083acae3afc3---runudorurovipeverurabis.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/57a93fb5651eaca59c5bb06f9a994e6d/raxonepexu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/28600817112.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fee45a72c---rifixorexisibarodina.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705bd9c1c8a---piwekemuwiwekemijapi.pdfIn PDF document text
    • https://dptech.vn/uploads/files/mivobidimo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/82620853790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=leanback+launcher+android+tvPDF link annotation
    • 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_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 18032 bytes
SHA-256: d41c3faf06738f426ff574bec553a2283e52d779353332f73dd8f4313be332d0
font_01_sfnt_off0001399d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 10656 bytes
SHA-256: 4c25e000c540fc285b0c3adc66c00f6182193467855b299447090ada4d3c1b5e

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