Malicious PDF — malware analysis report

Static analysis result for SHA-256 f061e0b05cab8f53…

MALICIOUS

PDF

72.4 KB Created: 2021-09-13 00:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c487aa0169a1773237da1b01c385a59a SHA-1: 9d8b985eeb8e9be07ba82f8980b3a827e2f1b486 SHA-256: f061e0b05cab8f53a5281be3c64ada8a25d82888dce941027596abab787ba435
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=redmi+note+9+free+fire+test PDF link annotation
    • http://www.truca-taoules.com/ckfinder/userfiles/files/nibawasoxerajonip.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d44aecbc94---2456726247.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135749967bef---5968111982.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/zopegasibotadafuk.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a864a9150e---xonivawotik.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/miweduxifefoziv.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/gotikaw.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/70511167383.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/gunakapufawonuzuwajefig.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/mutebow.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/26230895387.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/nujutoxoruxikiwar.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/funewida.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/raburulelazenabuni.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/67527691890.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/84436865254.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613689f32520c---30456896942.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/13351071391.pdfIn PDF document text
    • http://friulanapanini.com/images/file/29899965346.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/jiwavosapumu.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1092725690.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/84223288317.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/60415933471.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/tafoduvor.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_off0000b4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 17844 bytes
SHA-256: d503319848b8239774477f98a8d6a38b4dee38d5053cdc8fd9e311b674647c3c
font_02_sfnt_off0000fbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF2 10520 bytes
SHA-256: 599b7a0b638eec53d0397426ddf406069370b8ff4936c9dd67f7ff5ff4a14347