Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d45122a11dca6a2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 00:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b095dc18100c40768b37d1534777b8c4 SHA-1: 74aac938cf8cb81882e9cd65268d49dcfd74d229 SHA-256: 5d45122a11dca6a2b3ee09f33748403b45e57a1ef5d955cf3d9ba4ef3043fbae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://goldartline.ua/userfiles/file/vogoxo.pdf In PDF document text
    • http://geodavidepini.it/userfiles/files/nuxikizam.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/talijuvoger.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/60785840667.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/nexupamuvajitibutejibiv.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/84023394000.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/vewigodipofizimoniporar.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/54355259928.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/asokafkkkl9va54cu7105tcvr6/40934598495.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/negufiga.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/46219133625.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/lajiderageputox.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138821148eb3---37745137397.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/mebebelunanijajupetuxabe.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613407087553a---73295399979.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109031253589378.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mil7c8v35kcobr7jqan7ahfqdi/suliginezugekiramofimi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/40a4a84522da877709b5333e40b87f73/sokuvarilivonegi.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/47388461544.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/rojabiwapomoli.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/dodexujunajafim.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/39539894270.pdfIn PDF document text
    • http://metallpress.ru/files/gobewavelubebasip.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/36684864052.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/bugamoratidedelan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pc+freezes+at+bios+splash+screenPDF 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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 18328 bytes
SHA-256: d5b1da904921b9fc53ced9105ac6ddd91d39ecba42990b37d2c49b699a894dfa
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 10780 bytes
SHA-256: b372389ceb6849b24d274edce75edbab375b7527b4c43e965bbfa2e663ea2424

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