Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40cfc7297f3e56a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 22:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46c688f7c090dd130c1b5f5648f6dc37 SHA-1: 14b076da9fd853b654650e04835b4c318793ed66 SHA-256: a40cfc7297f3e56a48d66cdc4f8e7c267b6081fbdd13c951d3c36176aa661f01
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=real+driving+sim+obb PDF link annotation
    • http://amoy-art.com/Upload/file/gapamek.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/45991029634.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/19552977456.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/30625224518.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/poxavafevasete.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/56059945848.pdfIn PDF document text
    • http://orthopediedelft.eu/files/24634342574.pdfIn PDF document text
    • http://mextro.de/upload/files/39753240385.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/4469410021.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/62169911464.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j9qpc58av73fi4ho0sa7m4q311/10559615338.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210914114751.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/luvuxugomi.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/67937329272.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c4e663c808f4c4bade72e0899300863f/vatavode.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/33512923581.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/xesuruzo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/82661744344.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443338146cc---62605156413.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/juladafimexogi.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/43850144361.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xexufuxitabelosam.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/78983735376.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/ladij.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/rejixozagefisoluvam.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5196_20210910070155.pdfIn PDF document text
    • 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 17764 bytes
SHA-256: e0bf4203395e10a3f140f7d26aedbb0b0acaf720e32dc04e77db1c2cb3f0c47b
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 10744 bytes
SHA-256: 2b1941f054a2dfc70a692768fb83b9799d6bb1495810d5100c3faaeb8a41855c

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