Malicious PDF — malware analysis report

Static analysis result for SHA-256 6385568a7b73a45d…

MALICIOUS

PDF

91.4 KB Created: 2021-08-03 22:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59d8eda1f70f5b1fc5379f94f78310e6 SHA-1: 850859a55bf77617d3b7e44300f8092a233fd269 SHA-256: 6385568a7b73a45dea7209e03a42b2cf0ef5959ac37a0f694be6c00d88c10f0b
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead 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, so the primary indicators are the URL heuristics and the high confidence detection scores.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=romeo+and+juliet+love+story+in+english+pdf+free+download PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/62491744524.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/bogitiv.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/bebub.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e94305898---60745607352.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/guwefowokofumopovekiva.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c6239d8d9f9---96759706481.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4f617194dbbde84d008642d031a61634/28066653733.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffde305b8---burevijevip.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac9ba2ac1---83817057674.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cd6mdjbipsulogll2jg3ocrb16/8518767996.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///61361925165.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75a728b56a---golebik.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/366b1412c201c5c8312e7d7a6808b511/54939743978.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/vorid.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4edf35aa04---55476344836.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/rerosigebufinijokuwizu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/sv9ladhf7qgav4tfcvmqlecj3l/ninujuxoxefor.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ea64e3511626ceacadcc6d45b1e9d6b0/lifujejebi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/8vms419sl3970qdtr0h2kkk2n5/dadijifavivu.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/6297854372.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/zakarixaxusa.pdfIn PDF document text
    • http://gptools.net/userfiles/file/vikiranosesixaxodo.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_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 16644 bytes
SHA-256: 4057d507a07e9db389837e8552f9fb709194f4ab093839c35a154a8853a85717
font_02_sfnt_off00014397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14397 11484 bytes
SHA-256: 4f5037d570d302c7967e8ab2a25cf59de9150ffab0036b7b48a54b2770fa532b

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