Malicious PDF — malware analysis report

Static analysis result for SHA-256 5565b78db65dcc6a…

MALICIOUS

PDF

89.8 KB Created: 2021-09-23 06:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91679c8c3ed42c70223e0a774d990cc1 SHA-1: beb49eb610286bbf8f50289f254961c7c67eba73 SHA-256: 5565b78db65dcc6a3f4d4064ca513354ae89db71caac4c14f1c5b2d19158e77a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary attack pattern observed is the use of these links to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://crewmak.ru/uplcv?utm_term=pixel+ota+update PDF link annotation
    • http://tatishev.ru/admin/ckfinder/userfiles/files/13000994262.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/tivixidifotitaroxugumona.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/92718277036.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161351bbdba0e8---29913448414.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/18726666042.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/40700285637.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/92250699599.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/suzofumazozudosuroxud.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/welibo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf208e0f7---85387791922.pdfIn PDF document text
    • http://mfahk.com/upload/files/90729142531.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/gupewonixik.pdfIn PDF document text
    • https://schmitz.cz/res/file/sowujez.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vewexomuribagutepaxibudem.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/38267065021.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/87969649874.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1845a12e2---vaborokar.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/megutarodelufufusaz.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/28688186447.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329aa82d92e---dekirixewoxol.pdfIn PDF document text
    • http://scsychem.com/upload/files/65153822218.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/53249899666.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5b1a3d32781b426db7e6bc136d588972/gomonusipewogu.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/lejegisur.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_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10216 bytes
SHA-256: 63631274aec125786fc5cba88b525c6500937a158667e90a0260d0d8f9f6e027
font_01_sfnt_off00011371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11371 17644 bytes
SHA-256: 2f1b0e01926a712ccc23c48aaaee35e710e1bd3e6320bdbf5aeb27520c8e4053
font_02_sfnt_off000141d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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