Malicious PDF — malware analysis report

Static analysis result for SHA-256 0629f6e3291d6d9a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 12:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7272e023c9e0ff5558e4c7c890754a6 SHA-1: a2dcc7d3dffcaf4ce3c46112c70fb916d73ec4b6 SHA-256: 0629f6e3291d6d9a36b7ac980e32206534277fb98ac251917f1307fa006b9496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=format+sd+card+android+fat32+or+ntfs PDF link annotation
    • https://subded.org/userfiles/file/31763698584.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/davozamixerekixafap.pdfIn PDF document text
    • http://all-premium.com/user_file/files/gexexupixod.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/4933466927.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/53486705362.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e18b0ab3b94e6bdd10b3e3332e303fb2/tawevafogepuzokuxiwunibak.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161305d35406a1---91161583941.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/71214713844.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/vetadanam.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141118e78db6---96377010158.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/uql0oo3gbid84ne78m9501aq1a/vegozolavigisolet.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/45793533572.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/10075995468.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/11477522362.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8471074e---lulugozemobetan.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d1a121e2dea70bd6aa0a845c052a9b8f/6334995641.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/36193851691.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/97443732502.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/purunesu.pdfIn PDF document text
    • https://dellrein.ru/content/file/soxaku.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/98997952556.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/xililotemiko.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/76610677870.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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 10728 bytes
SHA-256: 225d48018e389802e8cffe68e304efe408e4cf2829185ffb7745a538d6a116ec
font_01_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 18472 bytes
SHA-256: 4a459bb2930d56b67cb4ea5508e060eab0e37453b22d082b734cf12baf64aee3

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