Malicious PDF — malware analysis report

Static analysis result for SHA-256 1594d11ab92bbcbc…

MALICIOUS

PDF

71.9 KB Created: 2021-09-04 03:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e697c085245ac5d4b369f37fe8119912 SHA-1: b1470905425ba75bf3ec3e2ea9494995183716ee SHA-256: 1594d11ab92bbcbc913032e0c375554c83fde4a16a6e3d5097a5d0415dafc222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the use of disposable hosting for link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://fouladsazanco.com/Upload/file/20571697768.pdf In PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/98840f42381e1231ba192eac385af8f1/97825112179.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f2m7qtuqrr8georu0uq6ib1gd1/61581669444.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4lnau0eiu38um4db7u0ln88v63/43602632255.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160858c70cd67d---luxuxalukesirewo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/irosc1vtfbcnmpt9r4gabne51g/22476144467.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/27564661602.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/568075ced9357f1547e0aa82c6a22e25/34051221038.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/88754523176.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/gitizetolumifiruwadezefot.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/a747dbcf01d9b69e14a07746a8ed8ac2/miwalinopunafi.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/gomiwivipedulikatoxe.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127773f9aca5---jezodekuxisovogawuxiwoti.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/tatobifubemowa.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86acebd7---fogeg.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210815_A57F6172FD7E9E32.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/773rujt2a9ra3pqquhpq8dfo6k/32168894074.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/56393438853.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/goladenizuvunotowizejuzod.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e12600d5865---59214809699.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dcbebb2d---vadejeso.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3414e33e1---85245786872.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/mikowimozuligeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=crabtree+valley+mall+map+pdfPDF link annotation
    • 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_off0000b85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85B 16312 bytes
SHA-256: a45f4a88a4e268232b5ede5b2cedc1abf98f9e1c36c901140e54ba13543fde2a
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10524 bytes
SHA-256: 188832245638032ccd9453099addaafcc3a50f3a2720c5e28fb83f2556e5be26

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