Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1a08a08b132aa7…

MALICIOUS

PDF

83.0 KB Created: 2021-07-02 04:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd7411b74d8895cf6c4db638ae5dfc40 SHA-1: 1ae3c750246e48e97d3d68c7d4a7dbfb1fd34b6a SHA-256: bf1a08a08b132aa7d7054f064003af0f6c7112d10b91542f8e466ac2789cad6f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to external, untrusted resources, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=answers+to+explore+learning+gizmos PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8b328434a8935a79e053d5fb1ad67dc8/96636807730.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/36190555931.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/93665704746.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/67651987396.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4b9si38l6pk4325mfq4oouf86/86182627242.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/52qrrgib4ll1i6r6ukli717k3t/xuduvodad.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/54953205288.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/85326851455.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/71273583302.pdfIn PDF document text
    • https://eslms.com/userfiles/file/xarujukof.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/23f21bfc812374d25b1df3331f7d0fce/logadu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c003c2d34e---12319610558.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/wagiwubadiperakupe.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/nijawonikizofuremun.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ee37b0b0e---rebene.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/968513928.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/zenukudotub.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093e9965099a---vuraruxekarujosula.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0f0cda60c---72809170613.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/9628287577.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b71f6f4066e---gozen.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0559f4e634---gonurumoxurijuxep.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 18696 bytes
SHA-256: e926d49f57a96e07485f3a64941a8aaa5175bb7a75107816260399fcb565f044
font_01_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 10824 bytes
SHA-256: 060b4bf5fd63a6e280d4ad32f116df383832e60a796e9de0709687b726eb026b

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