Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a1e8ae2b3a1241…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 68eca3d09965e66fa6dc9b1adddb2a0e SHA-1: e8ba459ccf3b3d9060659be26f4ae7bcbe35841c SHA-256: f6a1e8ae2b3a12418cb271c68ed0c4355937378fa8c3cc01389c2186822a742c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are designed to lure users to these external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lizowukonalap.pdf In PDF document text
    • https://mangonebike.com/uploads/file/tuvatotesobiwo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b207cf4c---50377292285.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/40807705390.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5885bb4c4---4851914752.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/272686988.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/wevepa.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/nazovofuneg.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/71912602337.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/83566083044.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075fceb24---73018305253.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/dinikapadixisozudurudo.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/xalalazitonuli.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210818030013.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/33312503919.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lldm18o6864jstg15870vbmmtv/91148120023.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070103442366.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/kedovufelapezarasegem.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c547ac8c0b4---77756713670.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/gd6qoci56g0f1tul0sk4m0chbt/nevofanumewananuneba.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mozun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=may+old+acquaintance+be+forgot+meaningPDF 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_off0000bcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFB 17664 bytes
SHA-256: 3b957a5fda35f1282f45bfb276a88d3147ccc87228b12d51243441c0f92ca30a
font_01_sfnt_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 11144 bytes
SHA-256: 08c54418132c90a37a98dc65f98c0649d2d6366bb26a10897e69909050860726
font_02_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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