Malicious PDF — malware analysis report

Static analysis result for SHA-256 00848896b526f168…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 21:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a18886c03276b7b4b90f40ddf1ea569d SHA-1: 4b7585b822bfa05b07df31431ea761e4573547b7 SHA-256: 00848896b526f168ae5d3bf6fd1283e6e02519d7ad1f5d863c5405fc615342ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files, many hosted on compromised CMS uploads or disposable domains. These links likely serve as lures to download further malware or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xn--h1aeekk.xn--p1ai/files/file/kutibubexaruvo.pdf In PDF document text
    • http://aedelsur.com/contenido/files/80172656945.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/999umqvesj8i1f0qgk8vghjnbc/wogiginatemolufunatum.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/duvukabafanoralasin.pdfIn PDF document text
    • http://asfalon.com/__files/file/zobomavatowete.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/14339953675.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/59953815907.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3937ce3cda---kemifutigarubefatux.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/xekitetojoju.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/47450405833.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ace27b3e628---96524658073.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/94197691085.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9086c46b5---bawaluxipiritit.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3omjev6r03l6st578ek7638cu6/fomotarepuzekovenepizemi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b417167c6df---38516261748.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160872e224a3a0---sebusuwemuroxadufa.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/70945207465.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/252021f834e1679812e420e0e00e82e5/25927524171.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaeeb1d798---xelalabevogenime.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3i256i8go807beaa6mutm511gk/27629937287.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/79bf7424ce834987b8a760e8712a8449/6578178988.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16112206b86087---8669315133.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2e7686b4f---82864637671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=onn+tilting+tv+wall+mount+13-32+instruction+manualPDF 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_off0000cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEC 11096 bytes
SHA-256: 6dd7be9df38518d33d714cadee8027c0b7acba4f25c45137f77be2cef90874b8
font_01_sfnt_off0000ea11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA11 17704 bytes
SHA-256: 76af2087e77c1900e97a9d716f4ec81167b965e67ce10fa5a1cc32e7620ef32b
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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