Malicious PDF — malware analysis report

Static analysis result for SHA-256 425c1113c5a9a2e4…

MALICIOUS

PDF

95.2 KB Created: 2021-07-15 11:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dc923a37c25c85ff69d19f781956f2e SHA-1: e32bbae84be62bbe6087c2ac3888162a9706fda1 SHA-256: 425c1113c5a9a2e4a19a2b2f0605a6d3db4a09cfe5a75b62e71c13af71db9405
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, which are indicative of a link farm used for phishing or malware distribution. The presence of these links suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://propactionvehiclesuk.tv/userfiles/files/54215181568.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d5ab290ad---64705055614.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tanrohe1km6ap3ds71fpoqghpq/60886403198.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/30639061247.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8beeabed---81181282777.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/acj0at43apjmmar4l08mcehiqa/mujusemut.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/nujajuk.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0182a3f3d---voreliberoze.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/61391990444.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/14297684834.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b4593746e---pajixubipox.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lrdqch3emcjalqf13b337oi7ub/89577649057.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf80ac63f7---dumozenotubamutapozo.pdfIn PDF document text
    • https://mojer.bg/files/43762271353.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1860f80b19---23128286606.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3acddeca3---58622905972.pdfIn PDF document text
    • https://banghenails.com/upload/file/novadofof.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/j8ri77uh9f5qdircebcn17evj0/982140529.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/21b6c68c8feea2a1f08263a74b27b0fd/xivolezal.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45c2e366a---konupev.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c59d8496a3c---fefozufosawopowideje.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/rmqvtqttriiuoucijb8nr0mq19/gukemupax.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/heoth2loejkf7v70ilo8041527/39349064962.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0e1574acda2b28b42c0aa25ae54c56fa/jatuzosuxigox.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9454dc6da9---xaxobusewoko.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/ronis.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/12433449187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+my+puppy+to+sleep+laterPDF 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_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 19740 bytes
SHA-256: 3acc5302de2221d248167bb36a3305c8b3fd8663cdb5a79fac14383d455cbea1
font_02_sfnt_off0001568c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568C 10692 bytes
SHA-256: 5bab7d679f3bca077aaff882b534693bb62ea2a8a11a9b0d1f1c2fe9fcc10b32