Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23c01bb425090ae…

MALICIOUS

PDF

74.2 KB Created: 2021-09-02 01:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c179ecec87071225c07200280168a6f SHA-1: bd7f87faae9e002b507be84fca370a2996dc0337 SHA-256: a23c01bb425090aef867b34dcfdaa0f6e14cb1279a274f5dc4a64b199cdc760a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/uplcv?utm_term=volume+of+a+cylinder+with+hemispherical+ends PDF link annotation
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/24650096942.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/0ce0gn9nn7etohmvb76ebn50e6/17413311000.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/854q2bbq82ueh54dn39fkpqkm4/31276605833.pdfIn PDF document text
    • http://zuche0551.com/upload/file/kixetonamo.pdfIn PDF document text
    • http://atek-ent.com/upload/file/5063596080.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/83655726872.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052223484573499.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d370bcdf38---silasemibujimew.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/dofev.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21a7642feb---93590697239.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/23977851637.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7d4e2d308b6f4fbb13ef0f3a92c08f00/bogizitepazisawufuke.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/78028117405.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210826_BB38DB3BA8112A6E.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4a161185---pimavisexili.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uto1t6fo7fgpvv7e39ktckk0nj/49903888321.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/tilesolusowalimox.pdfIn PDF document text
    • http://denge.aero/upload/files/mupuranus.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/sabevepipuravorije.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/90984590697.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/82d80ed92e2570f4bd373957e7fcca73/gebiwelurabeselirolajep.pdfIn PDF document text
    • http://ruresept.ru/files/file/33727841759.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7F 17276 bytes
SHA-256: 6fbdc086973530a6cfe1fe14f1a10d684c36a5ea1453aa0bc2f254db1e5333b9
font_01_sfnt_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 11152 bytes
SHA-256: cdc64e508ddc158d6571f4158d35dc3664eba12201980e93983b61aba0265907
font_02_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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