Malicious PDF — malware analysis report

Static analysis result for SHA-256 e702a49e32f53f51…

MALICIOUS

PDF

95.4 KB Created: 2021-09-22 15:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8065e5e0f0d0967d6f93822faa137117 SHA-1: 3bacb49cd446f3025415b8f09a9797a260d9fda3 SHA-256: e702a49e32f53f514d2b60a5e7b5394df27dd350c0866d84e859105e58be021d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=redmi+smartphone+price+in+bangladesh
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/14ac84587a6b3d11c3a04b7c3d0981da/39988133474.pdf
    • http://shosholoza.de/file/18105546899.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/rajipo.pdf
    • http://origo.ws/userfiles/file/66257208580.pdf
    • http://salocchi.it/userfiles/files/mapifitizat.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/64516162630.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614af497e114e---sakarorubule.pdf
    • http://dakmoto.cz/obrazky/file/tesuwifijaxo.pdf
    • https://mytekas.com/UserFiles/file/zepemiza.pdf
    • https://salvatoredivilio.it/userfiles/file/xoxowami.pdf
    • http://qdsenfeng.com/data/files/2516958392.pdf
    • https://shian-jin.com/UserFiles/files/fotozarenowawefiwoguso.pdf
    • http://salonorganica.ru/upload/files/13307663356.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1612f601c4f102---fejazigufobimedugig.pdf
    • http://quatangsongvan.com/hinhanh_fckeditor/file/55305965921.pdf
    • http://jamalcar.com/userfiles/file/govaporad.pdf
    • http://aminotp.com/upload/files/95173390930.pdf
    • https://x-software.cz/data/file/botelasasukanonenu.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e1be20901---dobomobijobinokalosafovon.pdf
    • https://superpart.com/files/13738406302.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zawuraganodowume.pdf
    • http://jandenzobv.com/image_uploads/file/pilukejezojasixowuzulopoz.pdf
    • http://acpiindia.com/userfiles/file/79096091905.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/42192141427.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/26086fd5dc6c290b3d40eb967ae15e1f/degewiduninugotolinusij.pdf
    • 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_off0001099e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 16792 bytes
font_01_sfnt_off000121b0.bin
f968f072f7250922c2388841cf05d1bc920bfb332e5f8e1447a44901fb6921f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 19584 bytes
font_02_sfnt_off00015623.bin
47477e4c920a11f2980218b075e50580b3af764bcaa9742d32abfadc6bdc67b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15623 11144 bytes