Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a99e7b16775555…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 05:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: da4e894a4f723a4e85a8b175e1c8d5e6 SHA-1: 0ec9923fef645a9f13d481062a060a9b862666d5 SHA-256: b7a99e7b167755550ba00f3711d25bf21f999fa9c7ca5e01abd7c5b0e42361e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to domains that appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nemeckystrakac.sk/editor_uploads/files/52070992331.pdf In PDF document text
    • https://chp-travel.ir/data/file/62657962423.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/51219550738.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58d00a4d0---88295007535.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/91c75f7133ba83169e5560f23396b7a4/darupobuwowutorutix.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42c23dfdd---28396838054.pdfIn PDF document text
    • https://noventa.cz/media/files/file/sekozagatojibi.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/gupojaketatalabolujavo.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/derizadeperimopowizosu.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/54620137935.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/59931504576.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084560f4d648---68821864047.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/16151189857.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/42490606944.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/86752339266.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rlfcfepcv5b7aqakklst729j05/72844933220.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/98936962866.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/jisofepilixomejefatapu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40155733353.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/dfb0f59a715deb6d2940ce8adc7c4ed1/zedofoworeresij.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1127bc8c---16133203298.pdfIn PDF document text
    • https://educhina.mn/editor/files/badururukitajazuralidozog.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/monovalasejaruwarafaweje.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/sadozi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4d4ee7a00e25c07f4879b196debef7ab/purunedozirubalivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+english+phonetics+book+pdfPDF 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 18032 bytes
SHA-256: 6c2d851393d0c5d944f907fbce75c91030ddd52f643e5a39c2f3f9a1521a691d
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 10924 bytes
SHA-256: eaede63ee7ed50374b907b7c98a510f946aba67e3e15d1b0ce1e49b6a3cccc03