Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9529ce2a4d18a9…

MALICIOUS

PDF

75.0 KB Created: 2021-07-16 08:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4e26b05377d48deda18338a4fd8daa1 SHA-1: 7a5388dde60d9d1a836920af03d436cd60d3cb55 SHA-256: 2c9529ce2a4d18a9d97cea91c4b1d8f431eb70ee5cc1c751db8c4f098e07afbf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external resources, many of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The primary attack pattern involves leveraging these links to facilitate the download of additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/55b42c03f288bcf847ecd5e7d598ebdc/30568726496.pdf In PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/60331112630.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/43748875749.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vgonjku9akh6iu9p1aur69vlr0/dodamuxupon.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/xezanixomut.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/webikire.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/28983377000.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d3c7ea309---remebekilenimafegep.pdfIn PDF document text
    • http://charivne.info/images/file/bixemodimi.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/rcupp2qdrg7dl3ptuplbdl1db4/gamoseki.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf74a6d25---16740222368.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/h4k4nn7oflu30vpkir22m6r3u6/1535392791.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/d310o7eckq7101eed0iv6o36db/42238845743.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/22klr6m0pmdi8va3hh9o819r48/beritogizulesor.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee964ca05b---kumizi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/f7acsvn4u5tvvsjttv9i7rgeuu/lekesabedarozarudetoz.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b052d188dc1---sadenivapoki.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5cdaa5e6d9ba4753191e8d8e8607140e/14616436334.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/6306030372.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b605591d71b---87326273634.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac0837c3b---40909788010.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/vemilojukurexi.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f084e51abb---49742948432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=i+will+enter+his+gates+with+thanksgiving+lyricsPDF 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_off0000c1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F2 16728 bytes
SHA-256: 9d3fd9c9929e384676be74a70223f153e34b9fefffdeab053bb2222e46509104
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 10700 bytes
SHA-256: c83e6d2e855dd664584968fe53d59c47a7fdd40d9f08fc83075083b59669907a
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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