Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22c59ceb6550e3a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 06:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3062613a1f4f57150ab4f0ea06b60f94 SHA-1: a8e58517ce1863c4101df701c620b889c17fb6b8 SHA-256: f22c59ceb6550e3a4f8d6657c70666a09f86b0949ae3218c050a53bfdc3e15e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=includepdf+multiple+pages PDF link annotation
    • http://tuzvedo.hu/elemek/file/tugifajonazalopibuv.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/18304853736.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/sutavefotataf.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61839346801.pdfIn PDF document text
    • http://fields-on-earth.com/4513490427.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b8ed09930---54026127487.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/mitosa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161191544548b2---lolebinedikefud.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/7742c05df621d912f00fba479f0ac9b8/91508283903.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/10729702788.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/29430929755.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/18914684899.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/vuforuxudagufuv.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/c87bb34a7f5b0eb2ab3d239cb6dacb08/moveda.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b9c703579d8e4f59b1bf2a4a95e885bb/salorumukuxasejatomawa.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/32539182100.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38713270d---jubasitesukuxepobalovup.pdfIn PDF document text
    • https://atl-50.com/files/file/59459460378.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/dca6f131a0e4d3ac2a3aff6d4009003e/41821183088.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160e436b94082a---dikitevakonokosig.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b5206384c---98996454926.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/69284366.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/28857363696.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079307a462fd---83576768428.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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 18240 bytes
SHA-256: 7cbf7bc334e4190b0da33cf8a274e5218fe5894f815b5095e342d88030a025ae
font_02_sfnt_off00012a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3F 10792 bytes
SHA-256: b7dec74cfbd5649af0a4f38f5c3b936d347f77c8fb03df3ee4dbe58599c3a3ac

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