Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a5ba7f5d2f5b80…

MALICIOUS

PDF

93.1 KB Created: 2021-08-02 10:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2006a64d4f9797cafaf17bc3fe85967 SHA-1: b0f472c5b8970b5607fa8f42226fddda997f7978 SHA-256: b4a5ba7f5d2f5b805c874e69f39a7e40aafda25b7130d71c12dc21350a27aab7
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites and utilizing form-upload plugins, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b043f3fcb9---11437754247.pdf
    • https://cleartunemonitors.com/ckfinder/userfiles/files/70523562479.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/oh80r7q4qolfh626flg4i8mtb1/58283046329.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6abe3aeacb---97479077328.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607796bbe20d1---34295951274.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/70715767535.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb5e99ed3---72521659783.pdf
    • http://kulturazebrak.cz/userfiles/fafilil.pdf
    • http://casaledellasignora.it/userfiles/files/buberifedokilule.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5af3d1bb---42797694956.pdf
    • http://yuhongzg.com/d/files/15843775007.pdf
    • http://elverum-revmatiker.no/images/file/wigenivarolikowaxesil.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e825a0d0425---54673468734.pdf
    • https://electroagro.es/pub/files/naguzawa.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ong35ut17fh0polvlrmi8fn8gv/zilegibego.pdf
    • http://holidayinntorino.com/userfiles/files/66522854376.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac530a65b5---vuxebudelonemifanijeb.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082996e45d7e---bojosefilifaxu.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c972c8fc---58286633050.pdf
    • http://geose.ru/userfiles/file/13483044798.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55713995a---rapozetezejekomirosu.pdf
    • http://smeeing.com/userfiles/files/8079878970.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/eb16cb6631d7c1b54d086883a510fcd0/zowizuvitariver.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3203aaa68---17786294974.pdf
    • http://cjatkinson.com/userimages/60500974465.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+easy+money+on+fr+legends
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010810.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 16792 bytes
font_01_sfnt_off00012022.bin
911e1b5799c2027de639088ef2b68b0e774e2d50855907a9d319cf762b69ea6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 17192 bytes
font_02_sfnt_off00014d01.bin
f2aa1a89ce1b4fcd8e062308d31e7dd4d292c60c1853c09e8feef8a6b0389f95
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D01 10796 bytes