Malicious PDF — malware analysis report

Static analysis result for SHA-256 173824dfcc1d56d5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 19:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4464972117931a89a5ab547717c1f296 SHA-1: 30fb09a03c4c5fc2a7f7e994be13122ee8a1919d SHA-256: 173824dfcc1d56d569a5c6f1ac315bb85202317a676df1576c21ecf6bcd56c54
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing lure, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the embedded URLs and the callback lure strongly suggest an intent to deceive the user into initiating contact, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/6d004d985eed04f4017038cc68ec2765/wexexuzimafavit.pdf In PDF document text
    • https://jobtiara.com/files/files/85018408367.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/438e55fa5673b86d71228d7802d3d358/63551321813.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/40435521528.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/42604169046.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e910435153---kamilomamajesabikofosir.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/fowerisazekowapegimogal.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/fuxurepirarukepizesiraxo.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/pitus.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/mowukuxaxexu.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/86503089842.pdfIn PDF document text
    • http://orderkai.com/uploads/files/wowujamovikepitafo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f309df2307---55509562284.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/93745a72654c644e3c1cf2964074ec67/7352027807.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/3741809755.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/27266158716.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/95078743080.pdfIn PDF document text
    • http://fohow77.ru/upload/file/bodufaz.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/pivevapekidejexut.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/5041461471.pdfIn PDF document text
    • http://fivelscope.net/fckimages/nasudefuxugudakupimog.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/36525118883.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/47201505809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=legion+online+moviePDF 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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 17272 bytes
SHA-256: 6c50544ed9395a21fa80c6877f0f4161609493f8a679fc2d2e6fe2cd962b2bcc
font_02_sfnt_off00011858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11858 9944 bytes
SHA-256: fcf16b29af696d083e9f8d54b111632b88bad8693b802845b5ab1b1f6924c52b

Open this report in the interactive analyzer, or submit your own file for analysis.