Malicious PDF — malware analysis report

Static analysis result for SHA-256 793a06c7af52fa8e…

MALICIOUS

PDF

86.2 KB Created: 2021-08-20 07:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 058da924b2e6da9fcb1135dfd0c4f1c1 SHA-1: a92368df186ced4342437abd5c5e5f484eba988f SHA-256: 793a06c7af52fa8eaac944a8d21e172ce6e8f0a260e03c65d66bde20aa77bde0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://pixomot.ru/uplcv?utm_term=zkteco+iface+950+pdf PDF link annotation
    • https://miguktour.com/FileData/ckfinder/files/20210720_2A45D2659B329D54.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/tolasiru.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/88247075106.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a8ef976a44eab7dbe49ed465fd7b84a0/30655666002.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/192dbe3985e35890fd626ba7a29389f2/dolazalonisusola.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f304e55a0157ce79bd1d491ab3470979/15535177954.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d902d45f6cb---55246709439.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a709d6a9d---20120294361.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/8223746868.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0ad8f2c8---21862522444.pdfIn PDF document text
    • http://aweibel.com/Photo/file/rojudedakoxaz.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mavarizemabawuroki.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/4111676db5a46555ff100713ba18b530/98262452488.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a0cdba9c51a69f0df468456ea9f0b0a7/65456231607.pdfIn PDF document text
    • http://aimic.com/userfiles/file/32860676874.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/nosixuwozitozopubel.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/zepokadatezipepubagojex.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7bca3662---3554905737.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/fumonaditijav.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/posuwojimam.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/2766997263.pdfIn PDF document text
    • http://euro-ex.com/79223620905.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 17632 bytes
SHA-256: 76edf5c5cc2e140e8c02f00631d8419631e0ec2c19c1ec89efb38ac8e76cb052
font_01_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 10676 bytes
SHA-256: 25b05070976c99849c2312dc11e082b323d3f887072b4acb6aa5ab5b6930875e
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 1684 bytes
SHA-256: 72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee
font_03_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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