Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7968ca0c7694aaf…

MALICIOUS

PDF

96.2 KB Created: 2021-07-14 08:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 426e2deed6fe3279633cc5562fd0a01a SHA-1: ba1fe3c09a7d2123803c7849935a43353a1ed166 SHA-256: c7968ca0c7694aaf6bfa8d61e4c28b8ea2f02758ac1b321891a57f252175952d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5iibjhqdaoc9k8ke1pq4a5gd14/93992335798.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc3a47e0a---sexivimozigo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7dba12b8a909883740365680ebb36fcf/getofajekupiladivoluwefo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ikjflgh5hc667m312867slaev0/tilibusixomorivesibifi.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/deab09b6e2db3dde8ebe060217ff6d18/zokotutolosim.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/637aadfaffe3623612956bc1f1b2bc34/23443835672.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/dubavarowevatipujebiwuri.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/48105279503.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/81420073968.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/pabowezimafowak.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58db0e7d5c---98929720518.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/39427950596.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba881a28d50---gawanunepawenaworikoba.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2a608526---nonisemoxigikejonixaz.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/37202309832.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/37fbb839a0f44274f1fd17c8cb7b05bc/gonelojefiris.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/0447fa4e9acaa2552f616687c927fde1/deburezotumilaz.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/70357597576.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd91d33de---3455516194.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098824a9fccd---63260670941.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/xofulosezogilom.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/80757143434.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/mp323va90q47hmr0b92kqepejf/fusedimowavivodoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=touch+audio+rv+stereo+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 10764 bytes
SHA-256: a0a14c81d6cde6815c400ac93bba260c31a5def8cc931b0ec3ff87f27f24dce7
font_01_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295B 19576 bytes
SHA-256: 9cd9045eb5ac37e7652b4e93d8bfba0cbc80dea90425c17c1229c6ab4bfe3443
font_03_sfnt_off00015b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8A 16224 bytes
SHA-256: dc06733fb1b3e8baa4303a7b234726769048d67753183ec25fed266cd0fe6b8d

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