Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd2f350ca8dd8e4…

MALICIOUS

PDF

84.0 KB Created: 2021-08-18 08:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8f532f550eb7a8b58a49b87d0505872 SHA-1: 06a2909b48bf4028151ad88907eaf509a16fa021 SHA-256: 4cd2f350ca8dd8e40be6f1f7509b08d27b9f6a8c9f0d624c462e8000cdb43dc0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://shop-exclusive.cz/userfiles/file/20258744020.pdf In PDF document text
    • https://brianhigbielaw.com/UserFiles/file/93772683659.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d7efed6e03f58cd0696d3f9b1267d18d/nepot.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/29576912024.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/latafuberuz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9182bc21a21299b9eb7f3031b8062e56/lijozenepilesakusi.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/wasobo.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/pexipavasax.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7d410e7ca---tafarutofoli.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/65156066527.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/95015528307.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/susomivezofinidisatuso.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b287608e491---xaxudevefusemuwujipaxobo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/10692285017.pdfIn PDF document text
    • https://5uempat.com/contents//files/74013949979.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/93774702123.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/nonegozivusinorapuwisemi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/2ccdda152a409681bf60e423d8c6ade8/jitomixubegajotixo.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210814_838401DA532F2965.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/tmja1iomqcbm94dab2gk3et7uc/naxufojizo.pdfIn PDF document text
    • http://exosushi.com/uploads/files/90415317121.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/xesetivo.pdfIn PDF document text
    • http://bamila.vn/luutru/files/3044362585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+crackle+tvPDF link annotation
    • 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_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 16800 bytes
SHA-256: a4123e65fae381042f6b287b439ef6b9c82d0cacdb44db76ae31d9f3511bfd11
font_01_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1F 10276 bytes
SHA-256: 8925bc5e811b0490b45c022f38580706a762c92e34287d2d6582d4cb4df1ee52

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