Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8bacc49a05f9e8…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 23:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad4a6b232a5cc1574716e1ca0adf2557 SHA-1: 9e2ec289a45d092cf513a95b8c9eb314482ca001 SHA-256: cf8bacc49a05f9e879e73bba4ce3ac7078c91b2486ee898697f5714a3156baab
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a link farm used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/966af661de689e7ac9d95f4874d5fd42/mekaromiseduzetudiro.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/135050e48b19e88d1f28b849fe4a3c12/92758167732.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc302de45---paxabarataxikupapewerelit.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/08be813e92e2c6875fd85e8dcf0d8aee/17195607759.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d89c5bb1cff93421c2a6ebea007bd52e/76180554247.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2650e2e1a---7994427750.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be2ea8156---31480515555.pdf
    • http://paillasse.hu/userfiles/file/xonimub.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160931c7ac4ce5---jovuzafetoxupamo.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82emsvvtvtvhk80vmovqgmsms5/69025845083.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2be5954f8---kosemuvejotabejewonipida.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d55c3b16---70537618408.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/1672626842.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e70bf3443b03de91eee495ebd254ac0b/46719954554.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2855e58d---dulenusilevabuwuposo.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071c81ab7629---57989920727.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5qbcsgt8rq8e40kcofqkdbbgne/turaninizojafiwud.pdf
    • https://airbays.com/userfiles/file/18802614344.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdde8325f---94547318361.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/30659543712.pdf
    • http://fitviewer.biz/files/file/79488360251.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=new+key+geography+connections+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f837.bin
3253ed03503f9c6ed71055818ae86d2a3835f9384b85879b5c8f030a441d0b9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 11124 bytes
font_01_sfnt_off0001120a.bin
bf3567e145000b26cfaf35d4889311ad21f5d6ab1017d9630564649fd7e58d0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 17016 bytes
font_02_sfnt_off00013e4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4F 16792 bytes