Malicious PDF — malware analysis report

Static analysis result for SHA-256 a055ad1be12260ee…

MALICIOUS

PDF

91.4 KB Created: 2021-08-08 17:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf3c5c1194f7aff621802cc5b9dab33e SHA-1: a8ca797475af952d3672d6f71a3a55c0242ea584 SHA-256: a055ad1be12260ee969087cd31cfd27c130467a3cb687eec3822df866c567c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://inwebjor.ru/uplcv?utm_term=how+to+play+toca+boca+on+a+computer PDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9246087c---7481761859.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e886f4d4bb151d3b246401213dc32519/47335790847.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/24484287083.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/lawopenomifo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1nq38r0fb2lc364d921i6crq74/32670864856.pdfIn PDF document text
    • http://suaups.net/userfiles/file/39011869277.pdfIn PDF document text
    • http://strandedtattoo.net/file/85202791272.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/bafodimuzupiwiredewavije.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/lomarub.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c16822f2c58---60072965153.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/mivan.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/4425507447.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6bcbf2ccb5b372e474efe4d0418f30c8/35420185038.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/4185311665.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/jesop.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f358b0fb8f---64016913957.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/80689824509.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084791fb1010---91899608922.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/39232855720.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/jusukeriborijo.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/61797538599.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q5dkg1ssrugbvmc1fl1dkn8c12/57677420988.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/komaladadige.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/nefulaborowu.pdfIn PDF document text
    • 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_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 10704 bytes
SHA-256: b88899d8b9a4d1e83740c12d8dd45dfc0836ac8082c179821a93c5ab23a4647b
font_01_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 18128 bytes
SHA-256: e2016fb238a26b355e788591c1e2747b3657c89e2485d0ba2dc50056170ed4db