Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f80be6b601e5914…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 09:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 314ce6bee42cf0e86c20d6aa213751b5 SHA-1: 11005bf99da76f2f73a93a8cfbec518ae32cd500 SHA-256: 0f80be6b601e59144fbdb60b5b92c98679e924729dc506e1ce2d4c518fd23360
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised CMS uploads and disposable hosting. This structure strongly suggests a link farm designed to lure users to external sites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613260ed9c4f3---guferomokeke.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138b00ce850c---sevalijitezunelirazi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136143512e04---69777307384.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109040346307411.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4573afc6---damegaburusep.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16131157f59fd0---werusopomakefafeguguk.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcdaa87997---mobaxuxob.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161316e0d533a4---79654535709.pdfIn PDF document text
    • https://fptica.ru/images/file/wolebipip.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/sikilonudidivepobexadix.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/67867059866.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/lenadugupojisuxor.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907051121.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/51484449825.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/rixofogosifutuvixeniwaj.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/vivewekibeb.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/84339996760.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/92833894292.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/rovedub.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/deginanoranijuliji.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/87440455194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=kodiyil+oruvan+full+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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 17760 bytes
SHA-256: 49b5fdc030918e502e7876ba9f9f154ee13ed5ad9078e208d583d8740828d766
font_01_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 10520 bytes
SHA-256: 26410a14f34d25b753fc392126ccdbcd2a81753d1fb531fc028a177350502f8b
font_02_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1