Malicious PDF — malware analysis report

Static analysis result for SHA-256 ababd3bbb66e16d6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 23:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 481081774388340fc2dcd674abcfd722 SHA-1: 34661743c4bbe97b2f2e175d9e3db9179d77917e SHA-256: ababd3bbb66e16d648b3ba90080e7b9622c460a2099c2eddd2efd51c1dc90551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded URLs indicate it is likely used as a lure to download further malicious payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://irlanc.ru/uplcv?utm_term=how+to+do+a+manual+platelet+count+in+dogs PDF link annotation
    • https://adikketiga.com/contents//files/rojemumevubivojukipobapiz.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/52307070262.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/rezozevi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b1f767739---53482395548.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e27bae57f---pufafugapititefisurejam.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b666ca605f7---seragufavolexomuxir.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/petegagala.pdfIn PDF document text
    • http://freetds.net/userfiles/file/sorenodoteguvu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603337424c.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/88629145827.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/nipafiziwedizekawis.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/julofimilinusavotexur.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/pozipowavatepijiseluvoku.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gimevulebav.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/9m9qt94tk41vmambjumuucnlfo/lisedelagoni.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/n9gqc8e75gs0jrad7dkebokcqn/zipevujexuvatanofudakov.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c17ba3962ab5b4284edf0f509cf5252b/53202897786.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210720_123320.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/63664109812.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/93011253629.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021828346264529.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/a9d6fd06ab119dc459f2aa25fcc153fb/40513309893.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/86825609153.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/voxojezadagafidejafog.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/2g1rjij6jm6a7poh8noj3bvgb7/41689838034.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/52430371829.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/zepedulegad.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_off0000be7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 16036 bytes
SHA-256: 7e682368367849ed147f2c59603f70787a2c9c662c785853ed8fae7caf2848ba
font_02_sfnt_off0000ff46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 10936 bytes
SHA-256: 915f56d2dcac68d44735f46f7838bf1caf5068ab06bda595dbaa58a047d2c4c7

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