Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d852e0df93fc3a…

MALICIOUS

PDF

106.2 KB Created: 2021-06-27 08:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3c7866e92676d8e89866c47e57ab746f SHA-1: 851cf397465305a108f57dc677fad1d339e12dd9 SHA-256: 45d852e0df93fc3ac54392b537d61b4aef735305a5a93b9ebe97216baab48bff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous distinct hosts, many of which are associated with compromised CMS uploads. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2kn49nmkae64mk1146b46p43kf/sakezonar.pdf In PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/urgleg2qh4irt1rqvvm7u0fqsp/rarupafuvuvu.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/kenomov.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082da31c8559---27829499597.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8a32b7cd---69993956245.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a27a67055---59378749621.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/17ae19a0f0fae2a698182557f526aa27/93045708211.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f47ed27141f123ddec6eb455e9611c61/runovopipusi.pdfIn PDF document text
    • http://cecev.com/stockages/files/60976761948.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec9534bd6c---fovewadinari.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/31736678323.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e68081f868df6ba1b7522b5163f374a9/gifutekasejexifupojam.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c876fa336f9---30372953005.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d0ebeda---videfalesebejugimox.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210528_3245D71EFDEA6810.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609057fba754c---70718802366.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/0de7aed0586846052c38eb3d9691562d/gefopobokimizorowo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/407fdb717acda02d2d75c29c1c3dcd77/99764895636.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xidogiviputizux.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e698a3e116ffe9a6d328b969f053db30/38719656871.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/66794897416.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/79412675615.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2rsr0b1dgnli7e6i6lp9bp8cm3/45338612242.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/51289684222.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16099e27cf02c4---51272446072.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8a56327187f00e7882a06546473a11c0/buweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+lost+medallion+castPDF link annotation
    • 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_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 19488 bytes
SHA-256: bd6fcddfef0bc3cebeda3a55e4c603b580fbd81111c16a8364edb13c50af2a40
font_01_sfnt_off00016a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A48 10496 bytes
SHA-256: d3ff542f6ff9b67d84b50d3fc3d31329a31587bf64edefc4940fea93745a9edf
font_02_sfnt_off000181fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1