Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8f60f4be91486f7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 04:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51a3528f1ed44dd822148dd4b4ade26b SHA-1: e333f89dc24b939fe0180643977b6c41adc53018 SHA-256: f8f60f4be91486f78c31320d70c8235b29031b360b64ebdd58951fc8df3fd4ca
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=adivasi+sanskrutik+varso+mahiti+khatu+gandhinagar+pdf PDF link annotation
    • http://portalkucharski.pl/app/webroot/media/files/domep.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/90790174427.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bcf48edc7ef410f6a46bb07142ad237e/guluwigatofovesodepukeri.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/vowinagarisugulogatefani.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/16/tatotuzanitemopisiganane.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/topagapozutujagezut.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/denumofulesuwomosoke.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/sozerevekuvixunomosujof.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/jidun.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/zamoxelig.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16119e6b40d752---kipinibizemokavad.pdfIn PDF document text
    • http://belst.by/upload/file/puzat.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160af615f4a61f---womal.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5585b1f3---92918893928.pdfIn PDF document text
    • http://lucann.com/Upload/file/gabalexilujizogofet.pdfIn PDF document text
    • http://hanifeugur.com/image/files/libobamogogesel.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/12147316246.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ac9deffffb552f07b370d86ca5fbd39/gubimofavefilopisalog.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66a2f82e---55027436462.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161193d62d09b5---sokibufaxowu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/84r39jmneett2bpq02frqccgb5/85591531973.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/tajagigapasuw.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/74654166183.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_off0000d300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD300 11004 bytes
SHA-256: d0f71892727b95cb7c09968dba1925abf2ad70a0f83acd5d31b6e4483cbc31c0
font_01_sfnt_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 17148 bytes
SHA-256: fc6e9b016d2f7ef76cbc7f2615bbad6cea1b3459482fb42070148ac69208723e
font_02_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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