Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbf3340e44521cf…

MALICIOUS

PDF

85.1 KB Created: 2021-07-09 22:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e9cdcdd1b0075359a09ba8c1084041b SHA-1: 439b07fd885b4d5a03c2a69aab512c5d3a01f2c4 SHA-256: afbf3340e44521cf2f0b6721520893e8c67f0926370804de9c11d0cc7c58aec6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of PDF_URI heuristics further supports the attack pattern of directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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 http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd1e8a298---nuvisegadujes.pdf
    • https://nutricount.cz/UserFiles/File/safaxajudokuvaparoxime.pdf
    • http://yi-xiang-yuan.com/CKEdit/upload/files/subabe.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26a1eefcd---71352242078.pdf
    • http://tajeer.co/userfiles/file/patifufales.pdf
    • http://2ds-creations.fr/userfiles/file/68566111968.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k8nj54u1ppgstqi8b9cij3qg6j/16442658941.pdf
    • https://castel.ro/userfiles/file/fegugebajagowararimuzivuv.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/a02a449fcd879b4b65718b0def01832e/josewilejefonik.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1371c702---26538956575.pdf
    • http://topstec.com/d/files/88116959277.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f63da32c8---8793354871.pdf
    • http://dlzj.net/upload/files/20210619054353679837.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607719b9994a5---13323096048.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/04e47ff71b6b683a5e46df8307344a48/19358729360.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56f8ae891---69833258436.pdf
    • http://chikatere.com/Upload/files/xisiremaridekumij.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/fagaxola.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/wesotobetijozalolasowur.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/visesojufafesezotalereji.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/36ae91332a589ca114e5e2d38742665f/28356538534.pdf
    • http://kfnmsz.com/upfolder/e/files/20210709114134.pdf
    • http://lhs1965.com/clients/880801/File/wuvudasegevokoravovafibaj.pdf
    • http://protok.pro/upload/files/96010469998.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=alone+ava+max+mp3+song+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fd.bin
23fd0e3581401d686defd51b9944a80620ac71b7f30dce5bdce109281bc4e699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 10852 bytes
font_01_sfnt_off000102ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 16792 bytes
font_02_sfnt_off00011afe.bin
2b2f69bcb2a8733f8119897694dcfb437726504d312b1dba3d93b85bd0b3e027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16936 bytes

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