Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc76de88d1a5c2b8…

MALICIOUS

PDF

73.1 KB Created: 2021-09-23 09:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 403a5fa5b37a69a5d52986715d547a57 SHA-1: bcddef442d55fde8427ce7b776b9be9fad3f7a60 SHA-256: bc76de88d1a5c2b85a5273f1e22fd145703bcc9a19c31376ce7e36ff4c20f84f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is flagged as malicious by multiple heuristics and an ML classifier, including a specific ClamAV detection for Pdf.Phishing.Trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. The presence of numerous links to potentially compromised or disposable hosting sites further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kondicionery-himki.ru/upload_picture/file/6174939029.pdf In PDF document text
    • http://dylogistics.com/userData/board/file/ninobixejezol.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/91873827340.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/xepekes.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050530074245.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95753722002.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a2bae5185ca018b000c6d3bd96adc10/gujowapuxam.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109022348507978.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/pazamepumutika.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/23176004594.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161367981d36c1---27530209180.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/29927071883.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/diputedidabururedupejujum.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e0459c375415d402445fe3d00d0bb531/lutexupapotoxitewojezosig.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/65007082211.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/tenuzibowixujivijawovaw.pdfIn PDF document text
    • http://badgerhillfarm.uk/kumim.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/42065358790.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/refivikiz.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/jerut.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/suwuj.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/diwuxebi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/xarefamegivazabol.pdfIn PDF document text
    • http://aa-nusd.jp/rowetozuxegumufixa.pdfIn PDF document text
    • http://school15-tyumen.ru/f/59339839939.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/xijusamokujabamixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=link+to+download+instagram+reelsPDF 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_off0000bb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD356 10724 bytes
SHA-256: 6c40615714bd0465ca9adc3ac5f8ca336b35a43d9d2c43960d761ea8d999bfd4
font_02_sfnt_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16656 bytes
SHA-256: f688e0aac49b893fbee82b5e575181f86637b7c74cb6db05797747c1098c0f57

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