Malicious PDF — malware analysis report

Static analysis result for SHA-256 37094a564e8695ea…

MALICIOUS

PDF

89.3 KB Created: 2021-07-16 20:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2b987f048717cc62699f47cd16a230b SHA-1: 7b761f59860edd3e8fe13961cebf13c0ac94988a SHA-256: 37094a564e8695ead43ce3833366726f408fdcfe995211b73a2736d4ef999f1f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm or SEO poisoning tactic. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://brod-plovdiv.com/images/wosexuwadogevumonugu.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/meruwiti.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/57852546575.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10a9e69203---11138271647.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/getovipeletulerigewijek.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b5bcb89f---degoja.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/jafadekepokigelubela.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/28d9d9da9340a3092f79d378fb7b588d/38287656378.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/33047421832.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/suwezogefugaxexagevot.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k3q5rbd3h71t374f2o09l42bi5/62335528108.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c7125ceaea0---tudejop.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071bde10b046---dufef.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/bopoziduxasuxe.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160846bede57c6---55518171337.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/414dd20922d945a6d3bd2118558813fd/16093501843.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/bimizisajoxugedepumavawij.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/93261855051.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/280657129397.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9bcb5d558---kedixelezes.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a696f6566ae---bopefufopifadabiw.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/ruzapezono.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072ca6411bcf---pabilitoba.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/90063560078.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/98714654861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=does+baby+spitting+up+mean+overfeedingPDF 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_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 16976 bytes
SHA-256: 31028466dd15d75a49b1a8e089a05c37e72f5ef692a14b76739cae739697917b
font_02_sfnt_off00013da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 11216 bytes
SHA-256: f505d545346d0fd1e07630ce1a9fd898ca38804dba77dcbf491c86a58f7c5fc6

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