Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f568f4b5a10922…

MALICIOUS

PDF

88.9 KB Created: 2021-08-09 10:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 514ec1fc1f99deace7768c044cffe0fe SHA-1: 02be3f28acc8c935113c72540148b25e9de29f65 SHA-256: d6f568f4b5a109228e8ef47a2012e9f1cc4b5baa3634ae8f416b8b3df76c3a7e
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=torque+drift+cheats+android PDF link annotation
    • http://chikatere.com/Upload/files/vixojupowefili.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/h37rtepem8m3jajdin2cu10cq5/47378744572.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c63196336---xawopejikujarawoku.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607204ea579dc---vedizavirirawoba.pdfIn PDF document text
    • https://sy-tech.eu/file/sipajunipe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca2a8af9e---wopasexosaravubuxutu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8193b42a---nobusux.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a121eb3a---84393068106.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/88791076859.pdfIn PDF document text
    • https://yorapp.it/file/5136285631.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a74695676f354d13958b9c9e06abec2c/69918468954.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd242bd72---71814987093.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/47095759968.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8d1f5012f80ff156e42f9d3aaa4c4653/32298168883.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff433bb92c0---89977485323.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/nagisojakal.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///98202679523.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/91024136406.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/kefunotelowirevidenozigal.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/38f1a478734a677d36cd4baea966e9de/18081345161.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pijuxofebemegenifut.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/27505406011.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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 18000 bytes
SHA-256: cae9fbacf635094936f8628e7e975e74a3bdc7dcfed2cd4b2c32144c99681c5c
font_01_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 10736 bytes
SHA-256: 77a5eb45b23fcf725552901270f8c779effda731eb51089bb14e3df1c3d6cfb1
font_02_sfnt_off00013de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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