Malicious PDF — malware analysis report

Static analysis result for SHA-256 757435d85ac6d00e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 08:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a22502e6139649b3cb78113cb81f96be SHA-1: 361b7b76e466a0cf451a2d8ee7cce5848fc91e35 SHA-256: 757435d85ac6d00e0c00e403264f9c695fedb2f31737a8a0452e7a47b7d047e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kielcenoca.pl/files/file/67929128024.pdf In PDF document text
    • http://moscow-vernisage.com/files/files/12288705327.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccc715f6a---85576026469.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/64230397061.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/kivaximizeta.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rewug.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sozum.pdfIn PDF document text
    • https://kaparatt.com/images/File/68904787275.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614075c7175f9---42754474012.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/90235955741.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/47235967148.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xupiparelalunevujojijuju.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/69854127375.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/55739511070.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/254cdf6a6c28cbf1e63d20d8b7471ac8/17173945652.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/41293983237.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/45936917731.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/3445275647.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/69349947037.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb95ee3ff8---63863193872.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210915142519.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161425e1093a02---68082132595.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/12415610880.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/16498544835.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/bavokufusowix.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/vewex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+korean+moviesPDF 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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 17696 bytes
SHA-256: 46e25ef732fae076f48a8cdd61126eb82c5707d77eba60a4106f8f82ebddda2d
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 10600 bytes
SHA-256: 4cd275866fae921edf926c187d1dd729aafbc8ed2eb9c311b97f5e515595b1e1

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