Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3722600061f3b60…

MALICIOUS

PDF

158.5 KB Created: 2021-07-17 10:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4cb174e6327021c2093f7d2c25c89d36 SHA-1: 3d4a6eea1d6699bf5d48204e4b24a6483195859d SHA-256: b3722600061f3b6080f88bd66ad846c4eae9d72389f53e3197cd8e6287556b68
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/35ea213c823d28cd83dff3e772221576/rajinekobur.pdf In PDF document text
    • http://herve-coiffure.ci/files/97409281535.pdfIn PDF document text
    • http://vce34.ru/attachments/file/popizadifubajotasepa.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/lefozerexibuxeterar.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/88048754288.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/wevolowajelixetikaletotog.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dba0dc33a---dejivusurox.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c7313c5b232ad03f3e54d1ad421bdf47/48330637904.pdfIn PDF document text
    • http://charivne.info/images/file/7553780602.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743597c91d5---75050758459.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/fikowowobefexas.pdfIn PDF document text
    • http://attlas.center/userfiles/file/fetudifufasegev.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ae04773cea1680b1729b13db4301b300/95648128263.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/79b28a8a1b91876e40ce73d1d8fca0f6/voribaletero.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f16ad0ca8d5---91069596666.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a65db6c64---84041718741.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/wubevejafizeratibaxesoger.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160abf27dd710a---fiwemofepebimavogomexi.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/15365716048.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8040af608---dasifoliwefatujederud.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/90408643876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dewey+experience+and+nature+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_off00020e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000226ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226AB 10680 bytes
SHA-256: 3748816e918de3fe7a3a8cba99bba3973030ba18b032cdaeb2af3d805b6f8419
font_02_sfnt_off00023f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F67 17260 bytes
SHA-256: bdb7549f7659709a53f198c0158384c970085af61dc88d7dff4861aad46d53a4

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