Malicious PDF — malware analysis report

Static analysis result for SHA-256 0756c5129a381b51…

MALICIOUS

PDF

85.6 KB Created: 2021-06-27 07:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19f4a7eb7721f9053e343459015a6f6d SHA-1: de7535968297f6aef0fe229e84946cbb656f4b8b SHA-256: 0756c5129a381b5125a9d795b4a524c922c2fd3600ad942962df6717b688417a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://dok-vo.ru/userfiles/file/vevomiwirajubodevatop.pdf
    • http://hoanggiaphatland.com/uploads/image/files/zigirenejubimanigote.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/54088820576.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efd98ca1e---gedipu.pdf
    • http://daeryuhealthcare.com/ckupload/files/femadoxisatunejamixo.pdf
    • http://nordicaluminium.ru/userfiles/file/78247797418.pdf
    • http://dnepropress.net/files/file/durabubefogade.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rebqfr624kfrh8962nvg8h7fcq/netinaxuxikokiretekanulol.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4770c3a512510c9b5db359d64b32f012/gudofokixakisija.pdf
    • http://otczenacts.com/media/files/bugusokipenuzegobefi.pdf
    • https://strechybenesov.cz/content/nunemixerovuludufav.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/483db48e18a1c5d89231a661b5e92bed/7858739047.pdf
    • http://vds-construct.pl/userfiles/file/62870416273.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb756e3996---fixujelodofubifovin.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40970ef44---77841901799.pdf
    • https://digireg.it/upload/xexakokowakazijajijapax.pdf
    • http://mhinflatable.com/upload/file/dupegixegozube.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3b3f313f---60420243181.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/452fc1ca357831ab80f839c8ccf7ec75/46403603721.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/6c9699448480d28dff667371a88d2b49/45153015773.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/5112934bba9dbbe45a2642cbcedf33c9/ripavofavud.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s9ue4lnboq2od24sf8ohjerejf/divibakalivoligawabibo.pdf
    • http://bookblog.kr/data/file//files/28056244244.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fillable+phq+9
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d642.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 16792 bytes
font_01_sfnt_off0000ee54.bin
f62dc5e3bc6166192aea78491c3a6c28e6469738e33c26f442f203f2a36809cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 17664 bytes
font_02_sfnt_off00011ccf.bin
2dfbe42e9dca68f86b15f4ce6f9523191effb21519d00e1fa9ee30935bb0f61b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 10192 bytes
font_03_sfnt_off00013365.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 16092 bytes