Malicious PDF — malware analysis report

Static analysis result for SHA-256 f02e34b6c9f267b6…

MALICIOUS

PDF

80.8 KB Created: 2021-08-22 00:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85bcb0fdc623021a73c834963bfa70fa SHA-1: 1cb386786df8ca01de13dc870dd80466808c087b SHA-256: f02e34b6c9f267b60bde893a64dc5c621f5691c9bb3ffc6ff5feecafc7adb0d3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fiwanafuvimexumi.pdf In PDF document text
    • http://architects-desk.com/uploadsfile/foluxolejotad.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/kenusaletediju.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/jimexexiluzefowon.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01799e3b3---8937700304.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae2acd670---34882601804.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/jelor.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/67829540922.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/18385436720.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c27109103e00ee63b3a7f327a26dcb0/vumapogigo.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/rukefulolugulifovovux.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/77cdda856c79702b73ab98963a86b459/51565495147.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210618124727.pdfIn PDF document text
    • http://gyobel.itpublic/file/tutimagodewudiv.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/53054080976.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/59152416047.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/62922106844.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/xulazedisidigatudefazixu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609188472a851---24527479156.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/89111498873.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/19652334690.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5350ba15113eadb3a474ff59adf13b75/55661499596.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d2bded0e---revibitikanukaburedasese.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/rovato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+make+a+paper+crane+step+by+step+with+picturesPDF 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 11116 bytes
SHA-256: d540ff3b9292434567d6fa842bf40fb968f8dbd5e439f172eab19c6995518295
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 17152 bytes
SHA-256: 5823a25d534e55784f6580cbe815af4877317ab1afb9a763fdcefb297f043316

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