Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc9fe5db6c49d6bc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 22:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a03b04adae45b833ce6e96b66bc02f7e SHA-1: 1df7d356d45f9a98ea556111886ebc42a07496c1 SHA-256: fc9fe5db6c49d6bcc2a84888e37ec2543c972e1c002ee04052c31692968ca00f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly indicate an attempt to exploit users via phishing or by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://hagelkonzept.de/userfiles/file/80526880480.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608571d6cc88e---57433473192.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/tuvazeruvuledon.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6baaee318e69a302dbdd71c09b20167f/54966673763.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/56266956026.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/72758230497.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a32db1e7ff8---94159857220.pdfIn PDF document text
    • http://altinay-law.com/images/file/sekumizaxejajigevipine.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/41140574120.pdfIn PDF document text
    • https://citytrafik.nu/images/file/16590189401.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b62d439a---39744887820.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797af4e357f---40802254438.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/fapasegipopoporajiv.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4399f81422---93182560907.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/zurad.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/20099702413.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160866b00df11f---15614954854.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/7630501424.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/27363159717.pdfIn PDF document text
    • http://apismorava.eu/docs/96892570250.pdfIn PDF document text
    • http://artospace.com/pics/file/derefav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sri+anandamayi+ma+books+pdfPDF 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_off0000c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EC 10804 bytes
SHA-256: be828b3e2dec934c8784318e637db81224498c3c0fc2984fdfb38fa659422841
font_01_sfnt_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 17612 bytes
SHA-256: f9e5615b6d13bc0211f05661449955b2bec2ecf36e37b3c366797c91369b7828
font_02_sfnt_off00011070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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