Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeaf425fa1ca52c…

MALICIOUS

PDF

88.1 KB Created: 2021-08-13 16:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11da1248bc2b8c2632becce674fff65b SHA-1: cae6eb118a50f249586e1ef0b5989b3a6226eb23 SHA-256: 3aeaf425fa1ca52cfa2e0460678ba3e17e350842e875ec29d77f776d9434d96d
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, many hosted on potentially compromised or disposable domains. The 'SE_ENABLE_LURE' heuristic indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://shopexpert.com/app/webroot/files/userfiles/files/36124903025.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e84207fdc---78518194490.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/vivetebijosolufov.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb3f8d2f69---didosulasijumisa.pdfIn PDF document text
    • http://irollee.com/userfiles/file/dunezasanafubezujadobize.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/supiburagizis.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/jorodupixeja.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/09quuj23be3arr4enqp94iibnc/35273637479.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ad91172b1---35328378652.pdfIn PDF document text
    • http://firegallery.ru/img/upload/56900738402.pdfIn PDF document text
    • https://marigabung.com/contents//files/70667056051.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16279602212974.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/86303247553.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/gajutukuxip.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd796b0f6d---3830622756.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7bc8fbee---43951418875.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/94631432941.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/13s0dtm3i82cpljdmvpfetofr0/sugizewilirijebef.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/32baa1b8a44f73241ac026ef3e59e709/37375230795.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/modoxanolavod.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113cd20ca81b---7254434955.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/nelorib.pdfIn PDF document text
    • http://webursitet.org/Files/file/porawa.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34060ac4f2---xesopobopazunepalax.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/r0b1h98e8mp7dlorbc6sdq7g58/fepuboxoxexibosugibugumi.pdfIn PDF document text
    • https://topaldanang.vn/uploads/image/files/73239402991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+transformar+porcentagem+em+n%C3%BAmero+decimalPDF 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_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 18952 bytes
SHA-256: 63174f6833862f5b9966c56a769fdbeb47ba41dec6460904f0ea480839f26c27
font_01_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 11108 bytes
SHA-256: a589e8b82cd22601e902bc072ef1dbb192762271bc0f925d5d56f240ac45869f
font_02_sfnt_off0001376b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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