Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b40785e823953a…

MALICIOUS

PDF

102.7 KB Created: 2021-08-16 14:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 79bc3d8d8fac5598c7b3dc387affe38f SHA-1: a82e7ea956adc32669031fb88c8fc724316cdb76 SHA-256: c0b40785e823953a91abe66018d88bade63e9c02c91665c86c73cfa499ade900
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a deceptive download button and explicitly instructs the user to disable security software, indicating a malicious intent to trick the user into downloading a payload. The numerous embedded URLs pointing to potentially compromised websites further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://huntic.ru/uplcv?utm_term=how+to+download+mutilate+a+doll+2+for+free PDF link annotation
    • http://yesilderecine.com/admin/editor_resim/file/74416343065.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cef87acd0---57281973352.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bb3e1d315---26671210412.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/27397919531.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757fa1cd891---nozarimufawu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4ec53fd1---93175219641.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a717327d4b5---genolukotidod.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a59afdf2b46aa4f58ac9488a67fe89a1/bevenazigibuxutokumaxovu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/79827e5b90dcdbff282879794cc3efab/gubagazofojim.pdfIn PDF document text
    • https://soechi.id/userfiles/file/kivinunux.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/55794315942.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796d165671---jomawepafipiz.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/dujesezovorawu.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/he21i877phdsrcvdhagobdgkl8/pijogedilovurajon.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/29842187495.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2b6982be---jasonokinubevoguluwujan.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607432d032bce---16566116920.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210716010409072.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082b471eff60---sudesawez.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4b3aaef7---gewovutedogu.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c920f3ddf3---70992179352.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/6dd13fc226f50a823ccad94f3081493b/80460036245.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17980 bytes
SHA-256: a7ed2cfb7fa8cdd862984f90c8abce4baea09762f4b30682b72660eaad54cc58
font_01_sfnt_off00014458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14458 10644 bytes
SHA-256: 14347c9e8391c1f497141cf7402bc28081f55e84d1c3eb00af7d99acc271e280
font_02_sfnt_off00015cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000174c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C7 16220 bytes
SHA-256: 205c85678e14437fbc546922d61d5c71c736a13baa0b692cd7968a8072049fb0

Open this report in the interactive analyzer, or submit your own file for analysis.