Malicious PDF — malware analysis report

Static analysis result for SHA-256 120cf9fc91bcb46d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 01:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33bed211e11b61dbaf041c634e6ad293 SHA-1: 42ba92cf37a8844a29f4ebafe0d02ebcf2f61bd2 SHA-256: 120cf9fc91bcb46d46fc88091c765fdd5940a64112412752e36e2d67695e6bfd
164 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV as a phishing trojan. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable domains, likely intended to redirect users to phishing or malware distribution sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chinatupai.com/web/js/ckfinder/userfiles/files/kidopi.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c33c48f6---4414454639.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f1106bf5639e4eb4613ba2e5841f707b/kunesulivoziki.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8pk11qt99oo8p69b8bld5hbvk4/20023373790.pdfIn PDF document text
    • https://tckontrola.hr/files/88604251659.pdfIn PDF document text
    • http://ihdbd.org/upload/files/wiwosinojapelor.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/tuwibajukegekirosusol.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/zivejelananatigiro.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/wokezeri.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/14076998395.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/55099371161.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/nuzipufijepazafesutu.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/tujebifinumivowaver.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a77f4a54c---xexujaximijaf.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/kusilasinomok.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/90328155590.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/wabugasi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259e718fb5---xofirawazogovifaxobujavi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ea14509f---ginejoke.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/nowagol.pdfIn PDF document text
    • http://budka39.ru/files/50374752451.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/35768742309.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/vegumun.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/xosenetexokiremiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=clipboard+history+androidPDF 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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 18588 bytes
SHA-256: 22e141faf3dca32d6b38182830802143384f2195f3efa911fe53ecb3d6a5f13a
font_01_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 10644 bytes
SHA-256: 1604961cfddfceed63a449d9ea88be2b5db3be7d779769df42cc0bbbfaa0c0a7
font_02_sfnt_off0001200f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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