Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdf9cf9493e9930…

MALICIOUS

PDF

84.0 KB Created: 2021-06-30 01:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a702287c8665045451c578213cdd184 SHA-1: 808bc4b238eca4e1bdbcd8221d124025da3f0526 SHA-256: bbdf9cf9493e9930b914f6c695e12b6f0a02915343a6d29e7af7f718b0b39625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

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://queure.ru/uplcv?utm_term=the+adverbial+clause
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd138723402---fozejimoze.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bbce8e5d---80904940860.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2991d70b11---gojigol.pdf
    • https://kudamatsu.org/userfiles/file/kitukojomiwixomuxa.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cecad946702---12980701032.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/481cb86d9cc4b467910b98351e156ce7/20614015813.pdf
    • http://ncdesign.it/userfiles/files/xibup.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v6skteicg81v3qv67bdeb0j2b2/sojurubogugabumolapugom.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/75393674287.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/d8aa09a1bff77c0afbd575d6fe03b1f2/37533000141.pdf
    • https://eberli-medical-supply.ch/upload/file/37643817705.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/pituj7ndmmie53b0tjd6oiiv0d/79228166838.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/682d1af02970b6c8617cece579ee0b1d/nujumitomep.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3f0c34aa---35415358891.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/78cff73cda1f2b84581f80fbea24989f/satenufunirumasilifotek.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2ba2baf2ac485f765e3ed59fa64148b3/nejogopasi.pdf
    • https://mama-light.net/business_school/uploads/file/32863737577.pdf
    • https://somogyplusz.hu/files/17150300716.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/jq09h3ba2fpknefkji5sa06q84/44882898010.pdf
    • http://brnc85.com/clients/878796/File/sezogofegative.pdf
    • https://beliangka.com/contents//files/51517447874.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc4c911dd2---71570530925.pdf
    • https://stef-nancy.fr/upload/document/91891393074.pdf
    • http://tebsc.com/clients/84181/File/4906126839.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_off0000e71f.bin
2eeef07052e4205dea18f80b5f979a588ec688c8297f0d679cd9f2844cd2d9d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 16968 bytes
font_01_sfnt_off00011356.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 16792 bytes
font_02_sfnt_off00012b6d.bin
7f86c5e757c7ab13901dd73ac72d04a139818f350d641e65f01cd2b909677e6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6D 10412 bytes