Malicious PDF — malware analysis report

Static analysis result for SHA-256 090640630cdf10c6…

MALICIOUS

PDF

71.1 KB Created: 2021-08-28 06:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72c442151460bc95c39fd850cea3abec SHA-1: b428ab82b69167fb4a9431a600949fb78e894fb2 SHA-256: 090640630cdf10c60a0411e02cf1270e7296071d731f048c85fa4ba66bb0893c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://isystemlab.com/admin/ckfinder/userfiles/files/83839819203.pdf In PDF document text
    • https://handientu.vn/userfiles/file/zadiripugavufugikobow.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/68939776777.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/xerixataroti.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/41859828055.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/nudasezodaneneb.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5bab54df48---49416650935.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/ganiw.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ulpia5ql9mkpf5mq4dvt90ah8/julisojobeguxadovubix.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/84439957918.pdfIn PDF document text
    • https://wonkingchina.com/d/files/sexabujoxexikufuse.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/55757334914.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a36371e6181---nijewag.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72081063694.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/folabefoje.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d317bf2139.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/35793088755.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/5ced85600e2f39a6376069fe73f77974/15129670210.pdfIn PDF document text
    • https://topupdana.com/contents//files/gudisofakipate.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/2966491279.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/16043927006.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/cff8b01ce237386aa76b5a3a70eeb005/koxuwopa.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/18644261215.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/19203329396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=overbought+rsi+stocksPDF 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_off0000b4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4EA 16164 bytes
SHA-256: 1054fa4f7689674d41956c2db5f99554c4eaf371ab60b5e7f0dbadc19e638b94
font_01_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10620 bytes
SHA-256: 77533c9d51957022261c4befe7066c607f09642682c7d397da03a68e82ecd0c2
font_02_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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