Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c52aef02be589d3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 12:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 56bdbae1050be0bde1e935b23d405ca9 SHA-1: 3b510527ea9b9be6131a1e2b4f3381307fa21ae0 SHA-256: 9c52aef02be589d31a1bef7379beb1fc998d95135350c1836409ebd7bc8b23dd
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other unknown hosts. The document's primary lure is to trick users into installing a browser extension or update, a common tactic for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161409bf4a25b1---25585403887.pdf In PDF document text
    • http://lso-msm.com/userfiles/file/labawisalumok.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630629103.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d5264eb1---5219305294.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/hi3aff4khbu94kpb6ng266knq3/15199102874.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/titebajorimikidusapivuvu.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/84885383075.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/joxosopugajoxegorofi.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/gozobu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/degigapefab.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/85270136597.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230d3e1d91---sugudifurepilan.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613dffa02bd3b---98416788183.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/terisuvafekuraxokesofi.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/zekufojazebipagam.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/70862204289.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/zuripopeliwekim.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nimew.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/jamilejanefiremogomonepip.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xadopeloxizi.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/25604340436.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210904_052432.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/14937bdfff9b73f8faddd3a14682ef3b/32600891495.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8ef49433---22831236488.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/xobavagufifavitubez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=brawl+stars+beta+apk+downloadPDF 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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16956 bytes
SHA-256: d5b8c659ebbd80c1302d4c99ed20823d6d36697328103bc48b5a2eb2f235a577
font_01_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAE 10664 bytes
SHA-256: 26b80ab02bf7b0bb00e9a7d9a50e01bf352fa2118a0f70cb7815086b5d2590a4

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