Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d7af63dd365c42…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 09:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1cf22235cbccb932249728b9316158d SHA-1: c91b1bfd9e036a892328805b1d75fd18e15eceed SHA-256: 88d7af63dd365c425fee948ca7c1da87a89fb22caf2fecf4ed1695591790f6ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://studiorapizza.it/userfiles/files/28567203139.pdf
    • https://attack.lt/images/files/13339475803.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/95246235621.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/mifiribajo.pdf
    • http://mapect.com/upload/fckeditor/file/xabexalamabomotezebojodo.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/hn3l0ldlj44sgo599jhk5b2mh5/baminil.pdf
    • http://ladna.pl/user_images/file/raxusu.pdf
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/99418181087.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bb4bb0e89341bcafa4c9c8fe22e93ca6/nezuxasanazodujedujofis.pdf
    • https://open-call.fr/uploaded/files/10426868460.pdf
    • http://i-harmonics.com/upload/files/71495519237.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146828e242d6---dagikirekizawimuxekazuzo.pdf
    • http://kovacsoltvaskerites.hu/images/file/kiginobebi.pdf
    • http://espokebar.com/uploads/files/wexomumizudalulekubaf.pdf
    • https://cjsc.se/ckfinder/userfiles/files/66024924576.pdf
    • http://studiorumeo.it/userfiles/files/15496958946.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bd4f7ee53---16104308658.pdf
    • http://pappteam.hu/userfiles/file/43682515925.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676f61eced---rajemagemaseduj.pdf
    • http://leebyunghun.kr/new/upload/board/files/56728214982.pdf
    • http://goghepcacloai.com/media/ftp/file/fogekamurodono.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/33489389586.pdf
    • http://xtra360.net/campannas/file/vofasowojipavomuzepusotek.pdf
    • http://ambcavallon.eu/userfiles/files/27073691472.pdf
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/xupodogewoledes.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/suvasuwovususuvabu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=modded+talking+tom
    • 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_off0000d0e1.bin
7795c03d4d548976650becbb502c02a58962bd910396bb7ee90ed1409c728517
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 18968 bytes
font_01_sfnt_off00010207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16792 bytes
font_02_sfnt_off00011a1e.bin
74256cae4727c75aafca186c8172cceb23fc35e57a9ba364e5434f86f7da542c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 10408 bytes