Malicious PDF — malware analysis report

Static analysis result for SHA-256 9539be7d740abb48…

MALICIOUS

PDF

162.2 KB Created: 2021-09-03 21:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 581eba7b697844918777581730f07731 SHA-1: fecf1997786618e44e29e9327fa21def792a528c SHA-256: 9539be7d740abb48bee531d99e4ebdfd4fa2b0dd5492a2799dc568c979bfcacd
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 identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm nature strongly imply an attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://consol.hu/images/uploadedimages/file/dotilovufat.pdf
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/64821820438.pdf
    • https://binhvi.com/upload/files/benaki.pdf
    • http://allycatering.com/userfiles/90955400179.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2aeeba7cc---14746019481.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55f1a6a97---25694946661.pdf
    • http://biomisszio.hu/tmp/bajijuniniladadizaxixesu.pdf
    • http://drlalashow.com/php/billboard/uploads/file/satowofogi.pdf
    • https://avenue102.com/uploads/file/rofuvizexafezenomapa.pdf
    • https://tavcam.com/upload/ckfinder/files/3561330998.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a00a675bc---14198305605.pdf
    • http://shuswapladystriders.ca/userfiles/file/fufisisijidopadad.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2e57e8fa85a43f690432a5eef7aa67aa/varedotoda.pdf
    • http://abwcrainhwy.com/uploads/files/tezewawokisamaze.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aadad2ee17d---36779727112.pdf
    • http://limoride.net/gallery/file/zibanapadoruzulovoku.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6387598950---goxodowolodomogokuf.pdf
    • http://diaochue.vn/userfiles/file/45429757162.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16124de6d6a22c---82465877828.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7430e2e7015e8af2b961fa7e94c0fbef/76920053919.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5444eb8ae4aa1ad824092368c80822d5/gafugeg.pdf
    • http://aloisiquadri.it/userfiles/files/76179320464.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071e5346cec1---guseruzinulozodewe.pdf
    • http://cybernet-ap.com/UserFiles/File/zulidipiloxuwoxil.pdf
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/nogoridefanare.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/eec1cb35366ae678d0bbccd229ca6f8b/xokujazelarazajikonuk.pdf
    • http://xboxheerlen.nl/userfiles/file/59924321874.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=convention+am%C3%A9ricaine+des+droits+de+l%27homme+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_off00020e72.bin
8071a27345f4300173d243b15e4dc3d9b9718c793ac355b166d33391fd0984a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x20E72 11168 bytes
font_01_sfnt_off00022820.bin
2a7523ffc485830f1634d76713710d7eeb10dd70138c0d057eba6cc652ae43e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x22820 22672 bytes
font_02_sfnt_off00025fc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25FC6 16792 bytes