Malicious PDF — malware analysis report

Static analysis result for SHA-256 03434e65e433b969…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 05:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a96f2d260ce07b76153c5eaeca7ea596 SHA-1: a33c9a51029e510670dae3f8f9b886b6ab503766 SHA-256: 03434e65e433b969f0935afe3de3038276c388fb704c7b1555355eb38e67a9b3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to various URLs, some of which are on compromised CMS uploads, and one directly to an IP address. The primary purpose appears to be redirecting users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/67108884915.pdf
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/89698061956.pdf
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/wakutagimirojeg.pdf
    • http://hangtatmj.com/userfiles/nefonodunimavipiguxo.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/12066317250.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b692679ec60fd3e83635ddc3be2619d6/22268212771.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfbe7ba05---20892953322.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/zupujogebuwu.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/60237106732.pdf
    • http://senseoftourism.dk/userfiles/file/77540026909.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/70406903490.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/83166228625.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/92d5a6a8ba1b6e33c1f3606b8ba647db/zowexopofoba.pdf
    • http://telegid.tv/userfiles/file/zowovalodujazunisud.pdf
    • https://tonymusic.se/UserFiles/files/39815487973.pdf
    • http://www.bufolari.com/public/immagini/file/felutunedalas.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0d6d1d0f---nixojugesimi.pdf
    • https://gonguyenkhoi.vn/upload/files/20879213178.pdf
    • https://speakingparrot.com/upload/ckfinder/files/31201800242.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/sagutunigavigawebi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+places+to+download+movies
    • https://www.posluh.hr/ckfinder/userfiles/files/40192408205.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_off0000b670.bin
2f85a28a7ff85c426cfed03b0462d236da4cd5bbbb6b007d77169dff0178d289
pdf-font-stream PDF embedded font (sfnt) at offset 0xB670 16240 bytes
font_01_sfnt_off0000e04b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16792 bytes
font_02_sfnt_off0000f862.bin
203e3c893cc3d9f51243e93abfea53624e41eef2abae48f56c1a3250fe409ae7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 10780 bytes