Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a67a1a2740cab6d…

MALICIOUS

PDF

102.2 KB Created: 2021-07-30 19:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 19c73c87c5917cbc2acb35396edf421e SHA-1: 08a13d45126b91e99b36f611bc469051a0392ab7 SHA-256: 3a67a1a2740cab6ddebd598b11d04189291efdeac921d99021c000ccdd8d8e97
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and a link farm heuristic suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oniceh.ru/uplcv?utm_term=que+alimentos+tienen+carbohidratos+y+grasas PDF link annotation
    • http://aep-tc.com/cache/fck_files/file/viriberejediguwewagokuraf.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/lenijus.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/jewozefomaripif.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ab79b1971627c5c62e33143b2244d0ec/kegije.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/efad1e0096f61721b6e7bd1364b7b234/puxufasakufukazuvisuri.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3qsic8hva8r0npfsm0q51rk8r2/nawuxejeziputewumuzawari.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8qamof69aje7j69em08ktlondj/tewageli.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/dinonazururen.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/pisalivawoju.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/71711439879.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/93359919394.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/fedajos.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///15217718331.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/poviluziwufov.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/38b2d50372f9ce5b20d11d7a6dfee19a/34072851909.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/pususopilikuvifojo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e536eae30c---wenixutakadilofeb.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91514d218---20673310950.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e34be00a5a---8651671737.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/69243622318.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/021a2b488c8215b8d5e2df622cf463b6/53064606363.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/88r6b9h2sjq5eit49f0cs5c9ib/28725012498.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_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 11232 bytes
SHA-256: fe1d7925945ac1e76ac3013a6a7ff4809c85cba5f610d190bf73f8ecfc236af4
font_01_sfnt_off0001463d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463D 17700 bytes
SHA-256: 7dbccd2076e997a44ffbeaa9c8370aea5793f6eaea923c15a6148ab644092d22
font_02_sfnt_off00017325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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