Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bc0f199fe48912…

MALICIOUS

PDF

74.4 KB Created: 2021-07-03 12:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8eeb7509f6df9879e347655873901d1 SHA-1: 163b6686366e0c8c6b1fc2e961210190d7d12a75 SHA-256: 81bc0f199fe489120587cc8c6436d0d72005e8d1104b37ccb260b9901108b425
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV also detected it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories, strongly suggest the document's purpose is to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ea7bcb83f---jukajofuti.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc13dc1b813---jaxur.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1073ea87b63de3180501c23fc7809e37/26825310705.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c736784f3c7---72292832584.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/97e2c3d255a11ba3fa0083d2ebc30353/wadekopaw.pdfIn PDF document text
    • https://congchung7.com/upload/file/21980880904.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/cjdnmd1eq3g5v0ovkdgkdg6scj/sinetuleweluwu.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/97982457163.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c424d68f---5936794339.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/gifodaz.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b23f854473d---sijejomugupekupavuj.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071c3074e3cf---74650448713.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab0c09d39---legunepara.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/94ac3c2eca4663e6ff20e3e69b7c033d/padakosunudunegezejemobu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a187f2e1189---84095494877.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vazenibanilelexonigenune.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f0704dcc---33740556984.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/puvovogusorajepazofabaku.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jugewofapemoguto.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/l73i15ui89h2bkfo9vrhsnuvsl/kefiravinufodoboletuwod.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fb917920---kuvetiwijigo.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/fbdup59unjs05dq4f4to67ps37/midinukudel.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/19b95855a1d4f57e04abd56fc4589200/91886565048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=do+it+yourself+meaningPDF 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_off0000c222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC222 16312 bytes
SHA-256: 0ca232b3e74406460d3726f7304eb06779a2c3d994068647cd1e92fc107ccacf
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 10772 bytes
SHA-256: 9c92cd84230b76a44d1db9b0de87f57ecb60d07e62b1a47dde845396d3f87dbe

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