Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5e4934202fd3a5…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 13:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 93b45dc3640441c8d1821a219a6241a1 SHA-1: ef54134d13654b3595ab8b0511447f1c02d5fac7 SHA-256: fb5e4934202fd3a55f01cc7deed5b2d22f6f6dd6c1aa43aa0cfbbbde9aa1aaa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are indicative of a phishing attempt or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3bqguaess0iugeagid87d48s6g/zisitopet.pdf In PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2442fde4c17c104e5b41abae8e6f4295/33627226778.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/e7dac198ee1a06fcd92db2fd373e10f7/96982922052.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/boe1phjdi5j9k4bo0sn17091gm/sarubixitejakinusu.pdfIn PDF document text
    • http://sns.hu/_user/file/xopozamo.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/moronaje.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/vivumisedam.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/65603797540.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c758a76d2d3---94875042675.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c842eaf6a---94289062276.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b626430918e483210c127cc00f7f330/49639392354.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///pojukozovozekoneduxobikuk.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16096da99db5fc---ruxawo.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/lafufuv.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/jb5n5fdmm9ggdfs6tjhvqv5v8f/25701945136.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160752573647f3---40389828704.pdfIn PDF document text
    • http://megalaserasia.com/upload///pemalipeva.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/81096157077.pdfIn PDF document text
    • http://hotstamping.pl/files/file/kavazujuzerajusijobifis.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/82898837938.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16087827407a47---zefugubonuvogozik.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/jogebijudobotawiruwafi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/20347119413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=common+wall+rulesPDF 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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 16700 bytes
SHA-256: 52a8c711d82b6e4527b6afd07f2d6c38d2b46edf2d71d34d46549698eddf301a
font_01_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 10296 bytes
SHA-256: 15910d2759796802a106360e31ced0b88d1715c339070c5edc618381c8cf20bd

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