Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3fa808d516a393…

MALICIOUS

PDF

94.2 KB Created: 2021-06-30 01:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c251cc75e32423c7c037377de0ba6e51 SHA-1: bfed9743c71aaf9368bd006775a34617c7f50ff2 SHA-256: ed3fa808d516a393b0cef8799ec3db03c279e5f609de64e4f8e646bff119d0c3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The primary purpose appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://solener.info/ckfinder/userfiles/files/xubikiboxanuleres.pdf
    • https://samudra99.com/contents//files/zozefatulaxixujixaforux.pdf
    • http://amoy-art.com/Upload/file/zirofexalit.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76252947bb---puzokasidopuvabarul.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/966f234ffbc92ca20f48dee5f45f2ce8/47056127238.pdf
    • http://aldara-latinoamerica.com/userfiles/file/29611028955.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3461e2863d---59623705171.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/de73fb0ed10dbedda69e2c0bee66b946/42190737963.pdf
    • http://aggengr.com/uploads/CMS/file/xomuvolid.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/17628045168.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d0c04a8b76a3f0ecc905e35d7512f81/xezakerejuzojupape.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6c407b4d---54577091722.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d42018218---bemowosorefarunebadil.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5d076b6e---wexoxipinuxozan.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16070333e2081e---kitekofivafamatar.pdf
    • http://thrifty-uy.com/files/others/xagivodelin.pdf
    • https://vigiweb.cl/dinamicos/files/file/wopituzolufef.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cb54cbd6---16084188177.pdf
    • http://akapacha.com/userfiles/file/dawufonezibuvime.pdf
    • http://forglass.sk/userfiles/file/32841697061.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/799gc3o75dd0jis0dhni60qkv1/31223812219.pdf
    • http://www.aluvascientific.com/UserFiles/file/fotukotizogituk.pdf
    • http://afghansolar.com/userfiles/file/fevefa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=if+half+life+period+of+a+first+order+reaction+is+x
    • 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_off0000f3bd.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16084 bytes
font_01_sfnt_off000108e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 16792 bytes
font_02_sfnt_off000120fb.bin
21fed7048ad8073f92525ed273f5f0f2320c71758e0bd462303abb1683e26341
pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 18400 bytes
font_03_sfnt_off000151c5.bin
fc2121d8d8c1d2dd7a0b85fd28140bbb03d75e3c955bdc9373ef6fca8dcfdf4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x151C5 10772 bytes