Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bfde482256a5d4…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 20:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f8274628ee54a259a10a14f844d7af0 SHA-1: fee8b4c9c2f1f7656791e834178e6e87949acb6f SHA-256: 52bfde482256a5d431ffc6bef61379732447ddd2197ae2abe50226e36b4427f5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=1+hectare+equal+to+acre
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/76640187515.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/3ac8e42140c07c76039a7b0a89897f95/65508915981.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1f857cd7c---65010628985.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607664d935501---mekabojogapej.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/u47s7f3lt49534jr806cogtq3d/77004044545.pdf
    • http://centronegozi.com/public/37512222837.pdf
    • http://nktrading.qa/file/files/89539229438.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/anv6d2jad1uaa87i6s9ncplf2d/52077470241.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3142890686---gunovuzafegajezobimu.pdf
    • https://stmarys-perthamboy.com/upload/File/77345801125.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b335987f3315258d643669a4c5ff07a/67252735063.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/751f94095520fa14949b65db0bc04f84/21043529065.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/34769048514.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608368248b7f2---98155098357.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a649ab654d8---86625878901.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cftnqreh17l6jqi850q08g39o6/2635516297.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84de0e6a2---35196407273.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea8391e96---8340616370.pdf
    • http://aucoindeshalles.fr/menu/file/97894648859.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/viej40etc04inmjmorsh196v10/nuzefopataz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 16792 bytes
font_01_sfnt_off0000fed5.bin
10199df81617771f9eef250e7d7466a55a8712beab128861a41242dcfdea1e01
pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 17060 bytes
font_02_sfnt_off00012b60.bin
38cb3eea0a356ec4aac3109bc3fca7850e42108eb42d00c0c12ef5af997eaa7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 10164 bytes