Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72f0e0ead1f0bb7…

MALICIOUS

PDF

88.2 KB Created: 2021-07-17 16:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9c9ce1422165288d088330ebae249f7 SHA-1: b1647ab4679308199c0534b0948aa71a58e45d8a SHA-256: b72f0e0ead1f0bb77d91a9822c177c8b540921c3e5000e06e2a6fae98c1482ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b7d9d5750---lofororunitavik.pdf In PDF document text
    • http://www.bufolari.com/public/immagini/file/pobipagosigiwo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8d041ea1---782611716.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gezefosabafadevuferiwife.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8ac7368b2f34fb1bd944f9cacddf52b2/88414531121.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c78af0a92b06737bfa9412089b780803/dikasutotopuremuxoraku.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8868eb267d---xetikiwegatusa.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/l66i35ge7rvfkerrj9pikbjfqu/miputivikuzef.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/16881895629.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210527220501_t84lg3.pdfIn PDF document text
    • https://strechybenesov.cz/content/midipirosa.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/dadeloronozubosagon.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/nojobikafumurisib.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ed7j38e0du9gh6maf4lcl69r15/lopaparedode.pdfIn PDF document text
    • http://z500.si/files/36228452531.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/toxisusod.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b4a080bea0f927e460d868573857f673/55918773803.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/53048357459.pdfIn PDF document text
    • https://parc-hotel.info/file/43832425446.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/zijonaxodijesil.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/138fffplokf3comutvfkb1e61n/balunibotekuv.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/2rftl2apd6scer9efebit0djmj/pamisanadoro.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/lfgs9g9l9scuqrqbsbbkpuf3j7/10009975500.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9a2b0df00c061d46b98a01445e710f30/sokavetabob.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/fiwidofitaripufekarituru.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/95907817621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+increase+your+snap+score+quickPDF 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_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 17240 bytes
SHA-256: 9ac45d9f12846876390aa2242e7148b9454b94f2992091f951791dc11e1805a2
font_01_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 10852 bytes
SHA-256: 41fc5ae20c14cffb8a3fffd8d58e7c62ab12cc31282eb62037c793a19ef12fae

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