Malicious PDF — malware analysis report

Static analysis result for SHA-256 58629b539f8647af…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 12:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52e9528b244c1295ba63fb073e318cbb SHA-1: 1da4e7a7971439e9b064841609a35472f07f90d0 SHA-256: 58629b539f8647af9297e426510b9f61ac1c9ac841ea97030f563f7807e53b72
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads or disposable hosting. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://istanajp.com/contents/files/34712402239.pdf In PDF document text
    • https://dienlanhhonganh.com/images/pic/file/juwejim.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/mudoxoluzib.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/9015171067.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bb247464626---58504128805.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/rirubigujapoxasiv.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/rofewovumojivus.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/42aeaa341a0560a9520bdf00ddadaa55/lutopegumemiwulune.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/rigelaludozumepovawifot.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/fetiganureje.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/24880891057.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/lonamaxagajew.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/68217255713.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ed8a1fcfd5f29af51c5ed291c911f7e9/55823319324.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/xatumemikanatabojunaf.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333331871c7---48853378383.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/76905906224.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/53362648497.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/24724763311.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/wojikumo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3e9de7ff---91408967377.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/36904421971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=horn+speaker+design+pdfPDF 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_off0000d3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 17840 bytes
SHA-256: 357f29ba11bb55a610da7777722f08bb53657aaae2e7a6e2d4c5bfa2705fd6ae
font_01_sfnt_off0001026b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026B 10612 bytes
SHA-256: c58c06af64276a1f4989073f4ab039312ac37e9ec4fc5f5710e2d3cfa26156cd
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1