Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f91db486b8d850e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 05:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67aa49da8f2bbd3e85cac13c9b7c824f SHA-1: 5a3533ea7160dd3f668f8549d2d4f6ccef567911 SHA-256: 6f91db486b8d850e7c6c55b1221ecf1dea4c1631d930cf62fd4691b8d607f094
156 Risk Score

Malware Insights

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

The file was flagged by ClamAV as a Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=super+slime+simulator+unlimited+money PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5562e6d0e24f62e08e2eca524a1e74fb/suvivarimibopisaboluju.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/sisetaroxoxi.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/91682862231.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/duvawomesalogukugoze.pdfIn PDF document text
    • https://slide-bearing.com/d/files/55934266516.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/97758890261.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/40496447644.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/tekuzidulumig.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/20302459840.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/tigonepagow.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/89288130646.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161413bb249b5f---towogav.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/jopupovavutuduza.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/8842655428.pdfIn PDF document text
    • http://industrialdevices.in/uploads/49861182439.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/vaxukufamuvemak.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/febarevibitekufitij.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/95324174392.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/piveziralidepevokuwowofu.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/buzodeperi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135780a86d94---59696886293.pdfIn PDF document text
    • http://hrudolf.com/userfiles/naxesenuvu.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/tadorijoxaxuludi.pdfIn PDF document text
    • https://service-panev.com/userfiles/25258048929.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_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 18192 bytes
SHA-256: dca3a74cd073f071fb6ae4b9c315817694c67531d673d390bcf4c1c755cf6be2
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 10840 bytes
SHA-256: daf9ebab5ca05d24ff787a92e1ff6681668ea76db7940bc0baba505173c31309
font_02_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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