Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f87422845bd6545…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 21:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ca72949856cccc8897072a31e6c6244 SHA-1: 0c18ec2bec55aa505594c6abe15fb880bf858c71 SHA-256: 8f87422845bd6545f21d8c036d27cf4d1885416d063e18804bc9c64511ea26e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of a 'download button' heuristic further supports a deceptive user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=logitech+g903+manual PDF link annotation
    • http://tochuchoinghi.org/files/metozujusejubezavam.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/koxokesarus.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/butavitamo.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/99207934926.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/metoradozelexi.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/66638713633.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/wefupo.pdfIn PDF document text
    • http://modero.vn/upload/files/sovilulajozu.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/nanekadafapad.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/6e61abe4958e08f5476e0b2891ecac78/lusefiresupes.pdfIn PDF document text
    • http://dzbnf.com/upload/file///mabigarasifodobiwomafin.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9f52a3d1---8498247340.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/otj5v29rvc8atn1asldamil2hn/56472659333.pdfIn PDF document text
    • http://all-premium.com/user_file/files/peduxusu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0c4f59d022e2851d09e694b8baf187cf/paxowuvogegulorumesu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607416fe2c37c---bazexapezirof.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2108011632525910926w12s.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/runajona.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a48645f91---49073498968.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a924a5365---2321092349.pdfIn PDF document text
    • http://getem.eu/files/file/jelorasikugixik.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/tutaledujozoreridugak.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/87151353925.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/duwelixukuz.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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 18404 bytes
SHA-256: 8aa914e5e44a5898237c94207b155cd5708f949eb7816448c161eeca8c4e8608
font_01_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 17200 bytes
SHA-256: e2ecd1a1601c38aedb38a783619783989e59b171274931c2609568146d30a564

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