Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf79a47f89d4e184…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 05:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 833edbf6c2951aee6b8c0e538604b403 SHA-1: f7ccd5350cfe38fdab80deb566173f48afd519ff SHA-256: cf79a47f89d4e18434f1b8de27fa84e0121a905d5bddbc7b48fd3740b98cf540
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=android+hacking+with+termux PDF link annotation
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/jiweliwabafinusadezavi.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/15087699474.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/62271226991.pdfIn PDF document text
    • https://subded.org/userfiles/file/wumubinupasivi.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/sefagemonigon.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/faxipib.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/63346211862.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/7659589386.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210913222411.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b430ccb54e---mepuxifili.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5a7843eab---59831771643.pdfIn PDF document text
    • http://master-vin.ru/files/file/pobop.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/85121686431.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/momivaratizefawog.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/vilebuxi.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/xazarisewivozuditagafeb.pdfIn PDF document text
    • https://stotex.rs/files/fuvufata.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/gudozupo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/b2lrjgg1ine6lbpg659b1vl5t9/65747199125.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac9ae6aa7---daseretiviposuremawov.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kikirozimixavexositifo.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/83104183665.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/73740672315.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_off0000af17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 10964 bytes
SHA-256: bcc4078c4185aac504aba95c9bd94c7be7a4c8cd1a047d40cfe9c5e1a4a08ab1
font_02_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16892 bytes
SHA-256: accaf39a4d0ff8de65a444b7c9c888785e7d6eda4db3f645a5e692c4146718e1