Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cb987e84af2970…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 10:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44d55968f096a068ce21817c4467bd2e SHA-1: 25b9f817a54a2298c2f920c259d93835876c4779 SHA-256: 33cb987e84af2970eb7a2703f05fe2143df9bec98d547c724a62f6f2f1f2023f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6071

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://synerhu.ru/uplcv?utm_term=samurai+jack+for+android PDF link annotation
    • http://labotinnghia.com/img/files/zaduxulimirapulenevon.pdfIn PDF document text
    • http://i-dron.cz/data/file/34390777925.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/gunupusulixenobiw.pdfIn PDF document text
    • https://cubic.is/userfiles/file/44195920722.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8ee37ad03ee4d4511055cb70363161d0/94697895589.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/49875899530.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/34441850465.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4abc21e5a---73238824614.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/dopojivokon.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/wumonavarep.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/sopudujove.pdfIn PDF document text
    • http://tecksco.com/upload/files/29086573924.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/6632644979.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/86930706048.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff365b278---xoritupeni.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613682cfce33e---xiwosekasopowuvipudobi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/83373357184.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/gejuromumalin.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/90984987453.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/3659318606.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/olttjcmi4rcoet5afauaicqs3e/69989703818.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/61296980872.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a8a83103---64896804766.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/99648031245.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/73242052456.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/10672697231.pdfIn 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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 10588 bytes
SHA-256: 9a385f8e6a48811df4b5902a85eac07aca8e4abe68f40a33457e03414c8ae454
font_01_sfnt_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16268 bytes
SHA-256: ae87505f9f63b394407ada3b3b7f56cc2a5529f64079cc5efc6ad44ef46cabb5