Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82acf42aba30d5d…

MALICIOUS

PDF

82.7 KB Created: 2021-07-16 22:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5b99695a8c3d6b44b839c9aaf3a9d46 SHA-1: a32144a2de2e34e5a9e0da462dbf7d6314fb841c SHA-256: b82acf42aba30d5dbc63fc98b723cfb70c79f7f4471dbe7abd99c9b336b1075a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and link farms indicates an attempt to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://myexamadvisor.com/fck_uploads/files/51792835565.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0e8aaa06c8d0d985dde6cf6e07477994/86867253991.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/c719n84bjtbmp1s1t484q8vgu6/werikogegonajela.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/iv0o1qrbkhete8k7lhemoi3klh/relitasuti.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/17573416873.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b65dcac41---vogigisiwawifowiruga.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/6954746631.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/3110582687.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be55240f530---wupifoluxasib.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/s0qq3khsg9h47ra1bpgekntbpa/godojijalisuwijopuw.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/vovil.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/15643438872.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/951d187ddab937459207e756f46c4f1f/68589492583.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45a05e696---99833129672.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c2553ed573b702f70d4f1cd766bfa276/76222063731.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/nejizopevetefevivufex.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/78369078216.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a9a6dcd2---lajawivoraromo.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/krpqijc6g7c3bnk8e9sous6loj/26170533730.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/pesufajedufojumidikariked.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/dinewibawekel.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4706c4b460c97c3b63d734717c62c7f5/25374623658.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/24702229130.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/12ae6ee63377a7e5dd5fc6590a00fced/madixesadejoxegogodezigad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=appendix+in+business+plan+sample+pdfPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10664 bytes
SHA-256: d57310a7dd4e0fdc5346d7aa8e865fe7342424fcce0fa9800120adc83d8a5969
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 16736 bytes
SHA-256: 1f027edf1650f27aa3093551e7b084d8fa96a34ec8076d22f78d2a166cf9bdf0