Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36b246d92fb1ca0…

MALICIOUS

PDF

86.3 KB Created: 2021-08-11 20:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01474e364ddf1451202d2575894eb9bd SHA-1: 56b8dab23a219ee5604f73e39e1c48ce0337ed93 SHA-256: f36b246d92fb1ca008836dcb6e7deb5c1aaf334a261ef5a403a3975eac74ba40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous other PDF files hosted on compromised websites, a common tactic for distributing phishing content or malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/94929847054.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tasisulirawaxojuxa.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/hmd1eitv6mbi2igqgn1vkgv5go/19591538263.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea83b9362---48610427835.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/pikedexojebivapifu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfe96d04d3---4134073005.pdfIn PDF document text
    • http://surtek.biz/image/files/20150120_001638.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c64768851---sokinowa.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dbafa7491---16060713011.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/bepepogiletakowigol.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/23440433863.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/70670058551.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/bamif.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1602adc4c---nawuxesodesujujojazi.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/88733731061.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/22714332515.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8845b2d0ad---lijuregumodoluto.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/fefixexadibanegaparawifij.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f3fe2233c73c5694d55c6868b2c2c9f7/vakebujagewarijibara.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/56614833366.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f50ab7f9b---xebinaxiku.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/geforejilufa.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b23c39b1---duwimadili.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea2b1c551---15152372718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fox+sports+go+app+on+lg+smart+tvPDF 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_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16804 bytes
SHA-256: 14024a2ffb868b8b86e48d5ab6dc43480604f4341da4312eaa8fb0fae8522562
font_01_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 10516 bytes
SHA-256: f27a83a54a77125480e610c2a3a48776458d11b725e75f37fc2b1cc503daff51
font_02_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1