Malicious PDF — malware analysis report

Static analysis result for SHA-256 856397954dbe8707…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 10:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85ab0b208f518395c3033fea9ac17a7b SHA-1: 57ec96e3a7fd189795f5f4db9556242f2ecb8507 SHA-256: 856397954dbe87077cbeb5654189e2d209b45280390a4e82960ece9ba0a10e67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress instances, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=arguments+for+social+responsibility+pdf PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a0643e1aba6c2a09e22015f626eebef0/87655216601.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/gupigub.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/56631154709.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f4c16259---48897005276.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/48062923588.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/35939706329.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/zusavemonatewo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721707d3535---zufekugufolabidomikera.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ol5ls9u6j8aksqc25oho7hrv98/15415423686.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fijozibaze.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b483d3c3c---dobasusomunirilu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0b2dd90e---lutepuxowi.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/14963246687.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/22084540549.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/db813be185406c90979b063b8983f4f3/fovizaz.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050600051665.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b73c1a99bbd92d6cdaf9f91ec0ca1ca9/muzerisabek.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bukobobozowazarobo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/4l1t76ab051i7j1bjbi5gcj3s7/53155447641.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/51972824400.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/79489155123.pdfIn PDF document text
    • http://getvisa.ru/images/File/33563627864.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89163df68---jexoriz.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e033a783f---17326641989.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 11296 bytes
SHA-256: f5605746d2718a27936f60bba71bc6f54923e6692d0d0196d9d4ae822304f179
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 17516 bytes
SHA-256: 966cbd214354ad082d8108652147bd93e73022b6aa13acfe443e263e1de963dc

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