Malicious PDF — malware analysis report

Static analysis result for SHA-256 329d49bc2edebdf1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 06:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f73c91b8f2170b5403012727de31334d SHA-1: c6ec984515eabb277609cc1416814ff54b56252a SHA-256: 329d49bc2edebdf1608528e166ae7344c358796c10c316b7055e1c9cccbcd63d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bfr-bialapodlaska.pl/userfiles/file/sunolemefixiwunipemi.pdf In PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/84621262825.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210607164658.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/73471107017.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/tijogilakerenuzekoga.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/pefeviwumika.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/f54mkroh0p0ev3p954dqkkckqa/63145750921.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/zamipezilarexuzo.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/64411758800.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6c678570---mavakuruporuwapebojudi.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/tilarupavuxurevepa.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a3cbcdaf6caa223b1a2482151bf63d32/95725861029.pdfIn PDF document text
    • http://amdind.com/userfiles/file/pelozojaxeduroxikawajeb.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/jedus.pdfIn PDF document text
    • http://markone-tools.com/upload/files/menabuvisavadebagazilize.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/96871032746.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/paketazigexedume.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/8498344537.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/sokozifonotebaponadasajo.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/38446563638.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/21395591799.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/75164791863.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zelevepizimuzubetegisofu.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/numuxos.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ceffe24238151acc61a7791567afde11/69023663620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inference+worksheets+multiple+choicePDF 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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 10812 bytes
SHA-256: 1a0a1435ce8c3bea7fb2083ce0d7da8413b1d320d4ed5d2e7bcbb4836575d388
font_02_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 18000 bytes
SHA-256: a2d0ce8e625b372f85409126da979a30c18da193267f849a9d31ac1ee54dbf70

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