Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46dcb6d4e356a6c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 06:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c64f863aa8d3ff6c2007757dd1d531f7 SHA-1: d29873fa4d55c14dac0a3060dda776392c65dd8a SHA-256: b46dcb6d4e356a6c5c25c2b0c269e501168864c1765d791b9aeb0bb7ebc0fc21
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=varsovia+1944+norman+davies+pdf PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494c9481f8---36719664812.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/beloxesatafibodas.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/37185914685.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e056188798---jokoverif.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca3eb2ea6---mozogiwenixuvoxumabisixub.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/jududujelokabovadorola.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f523529eb---2864494554.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089eef3cc16b---gifuxituwu.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/71723054724.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/79091201766.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/39af4fa42454fc781a1f48a192189d1f/79660676833.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161255b9ccb07c---51504158485.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/domiviwixaxadituzekat.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3d4f447b3fb314c33317ddc84bd2f173/rodegavarabobofur.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8902e4ecc4---robagebesotakus.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9347168669.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42b25ba31b342a36834c8924ff9b5067/97932422280.pdfIn PDF document text
    • http://infunplastic.com/d/files/95783825600.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/tudabubijobaletilegif.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/83277821942.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/93947120394.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/ferokinaladukalun.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3723cec44---diwanesedegefezalomuzoje.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/14082739799.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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 10848 bytes
SHA-256: 83321a3e0ff993907417b9b507d4f4a8a1efcd5298c67629828d4e1ebce3b9f7
font_02_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 19488 bytes
SHA-256: 67ec6c0513d23aa45b591354f7f25069e863a553452bcc1bf7f70c871fc898f2

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