Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad68bedbaed787d5…

MALICIOUS

PDF

65.1 KB Created: 2021-10-01 06:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f4477077c363eca03875b464cc60e63e SHA-1: c5d99e632fa47c1e414e95deddae9365200f5a43 SHA-256: ad68bedbaed787d5c8712872e23d9ecffee5ff3086f798f113837e33c727811d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The heuristics indicate the document functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9437

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://romangruszecki.com/uploaded/file/sigivenapananuraka.pdf In PDF document text
    • http://studionegro.net/userfiles/files/kujapobeluga.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161534f21bcb13---60178624520.pdfIn PDF document text
    • https://mediaskills.rs/files/fazorabawi.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/luzanoxoruj.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/60f0e17ef3c354a83c71d2dcb92eb28c/20590183107.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/78783448827.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/87355431973.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/nipewelizonak.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bkef7550jufve1f16779c6ijn4/65089252464.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/7484831067.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/degagulilawel.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/58783031088.pdfIn PDF document text
    • http://airmon.hu/images/files/6454718753.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/94988469035.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/33939845322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=idle+restaurant+tycoon+modPDF link annotation
    • 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_off0000ab7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB7F 16316 bytes
SHA-256: 454aeb9cbcd8ab05b886c75b7b2ed3720edd1ffec28d8e24b333b531b6851b24
font_01_sfnt_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 10604 bytes
SHA-256: 6cf14966727f4f83a686f42018bf3560c8b7a7dd96d88138e008693d5b2b4815
font_02_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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