Malicious PDF — malware analysis report

Static analysis result for SHA-256 54746763e1a91dd6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 12:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84c862168614abbb3f54c50d23801e2b SHA-1: aaf8020fc67d13254ce39a5b7c73bb7a889e7a1d SHA-256: 54746763e1a91dd6a20c79f41f9f16a0e352d304a51ea1b85ebc87650747d58b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The primary purpose seems to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://proektasis.gr/admin/spaw2/uploads/files/24437497823.pdf
    • https://aawyx.com/sites/default/imageuser/file/24831192827.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/noreketapojidiwalojog.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3dcda6ec2---83638975582.pdf
    • http://pettwayfamilyreunion.com/clients/39389/File/71336890544.pdf
    • http://phdpecs.hu/userfiles/files/82674586098.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/jibojoru.pdf
    • http://saxonrt.hu/img/userfiles/files/44324746063.pdf
    • https://citronel.com/userfiles/files/zunowutosufaxovet.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/04c91879c1f5e78430612dc860ddfb3d/niwakunamovudigurafuv.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ffda9f9055db1569c648764338c81209/51062710988.pdf
    • http://dinskayarealty.ru/media/file/virepu.pdf
    • http://hud101.vn/webroot/img/posts/files/vetepov.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf84585b73---10238395047.pdf
    • https://transmar.biz/ckfinder/userfiles/files/tuweratoxugi.pdf
    • http://tgtech-auto.com/userfiles/file/lotexenozolevazesu.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c6f5901011a508618830faf16f7453f9/nawekeduli.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e82bd5a60dd4664f8e674b9dd9e780e1/lunopuzegadirejisuve.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8dc7dbc28---jipenusafar.pdf
    • https://www.nevjegykiraly.hu/userfiles/files/33298823072.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc5c8c1b9---17765264493.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc21aa2ab5---bimakiwasoj.pdf
    • https://proxus.nl/file/valubevatikijikoxariwiru.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/lekanoxereberuzo.pdf
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/9399348709.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=norme+afnor+nfp+03+001+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_off0000cfa1.bin
fbca1bd4901ecb955714e351a048a5037cd30ff34e3e4596b9f8bb9566164e52
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA1 17384 bytes
font_01_sfnt_off0000fcb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 16792 bytes
font_02_sfnt_off000114cb.bin
a53416914f799d4114324e118350f6811ea369c3dd0079d0f54572f76f998549
pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 10576 bytes