Malicious PDF — malware analysis report

Static analysis result for SHA-256 795bf986fe4d16c0…

MALICIOUS

PDF

106.1 KB Created: 2021-06-30 20:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd66cb66d2cee71426a45de85e39d5c1 SHA-1: 047b8a3ab5e120ca5b80e350b3a42a18469c1724 SHA-256: 795bf986fe4d16c0ef544ad7bc6014dad4a3b9ff953582abdab39d411ba52f89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=muscles+of+upper+limb+ppt PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/c7l5qp43cfqc93p444frm7e4j7/wuxojoguxaxetidukole.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb70ee7a2c---52727371467.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/39204829773.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/82ceb35a44bda468ea8aa845c8623c87/daxom.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c276a8e4fd49cdac285a01ac67d96f4d/72534913532.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/geborokozorapojifoziso.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210622_6C084AF2FE4C4323.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cd395b1a0cf14af4896d0adce79124cd/vusezonojupisakenugutafug.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/ludojedazilarolo.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/45730749431.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc946af1b---80913076079.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mjhlnj5820siaoja6vae2pu6v3/79400289422.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/10068431837.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/3841829907.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/m44j48fp4uj2u1b5a13ufomshr/girilufofer.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4ba066617a497f09496bae0571a8df2a/45204655001.pdfIn PDF document text
    • https://panama4d.com/contents//files/dipuvojupi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160835c28c6daa---30132438506.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/7454496736.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/f43dcc996503f3365a39aead50d16879/zojojozebadonotetuvepikiz.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/torege.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a67ab55ea---pagezukobizujujikinexab.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tixifowosiponej.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4ae93fa61b2fe9bdd44aa7a82406d20b/pefiposulotowilesog.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_off00013d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2D 17036 bytes
SHA-256: 787f2e9a6a3a3a14d436659a4383b0a8e42cb3f73e7fc42cba2dd80e892a5e26
font_01_sfnt_off000169bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BD 10608 bytes
SHA-256: c79cd7a70d26560e5992a493fba7ecd11a855c4d5edd9ff0e57ba557757592f9
font_02_sfnt_off000181cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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