Malicious PDF — malware analysis report

Static analysis result for SHA-256 572054af7e005fb4…

MALICIOUS

PDF

83.3 KB Created: 2021-08-10 22:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a57fafdd774e62e53e6e223c2d1b4ac6 SHA-1: 715412728939e340eba055408c9606a285267454 SHA-256: 572054af7e005fb494a31a5e063a184d5be22ab5a4a7b96e02ca53223d9eb402
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hurtmar.pl/Upload/file/venidi.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2430a56f---67368963157.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/35674684085.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ruccc5ce8cvk49g35cteb7cvc7/nafivajubujazekotogumu.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/86005910880.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/71833778707.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/vigubumi.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vofafururajofereridis.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/81ab097f83800214f3f09e94bf05f2d7/87548544304.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7538c48603---67008131425.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/xolijo.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/8725943290.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/82711886750.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088a96d9d9a9---23901885075.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88217a9741---69336722583.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/96682794964.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbc697612a---xunutesoloxotejanuresotu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/80799253498.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f61e5646---tufifawu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1040bc9fe4---12060548724.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/mibisu.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/mupupefubituxutalerixama.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/juwulewuxofevimonajutatiz.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a70ead12ace---nunabemalajijuvuwabab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ae+dil+hai+mushkil+full+movie+with+english+subtitles+einthusanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 11164 bytes
SHA-256: 5ce9d0ab6691fcd21e61676c174c0832068e0caf14f04cbf974a3262dccf8fa8
font_01_sfnt_off0000e477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE477 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 16316 bytes
SHA-256: be390c29fae57cdca16046d9090cd1c4dbcd6fc9aa6195ab6b9fc42d27655841
font_03_sfnt_off000125ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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