Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b357089dd91298f…

MALICIOUS

PDF

89.6 KB Created: 2021-07-17 19:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 23a81ba9c882863fe60a5cf0d88adf3b SHA-1: 37b83782ed15c918098ceb658e49c6c9b6283322 SHA-256: 3b357089dd91298f490368b8eb754d373e9e7dd35cbbb84e994b381c91f81827
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content or intent beyond its role as a link aggregator.

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://shtaket46.ru/page_edit/_samples/userfiles/files/zegotuwela.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q3iofoprkm00f2r8ses7hng9l2/14249848739.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/kovomafawapafovuruxoju.pdfIn PDF document text
    • http://unseretochter.com/images/file/28205533635.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06611a68e---47898404808.pdfIn PDF document text
    • http://safarang.com/basefile/files/19265637861.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3675a6c96---soxip.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b6f9685eb---40507814935.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/64966236403.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/putasowepidifolugokagek.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e04cc690---17858819107.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/431734a80059171e6090440b129b9083/47319182159.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/cqmiktbb72978k28eqln4207qj/zisitusakikupefixuke.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/36382999066.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/juvabo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259a2f2942---kimewo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/8936846709.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160773ce150868---33535789463.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/01vjrn2e9a0c4hjmfomqj5e89a/samijikufabexobadajeri.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hi89doo1d3osnb1qbjr7mssi44/36324103001.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/52ebc4cd9fc0380c9af6b93a4424fc0c/risanotiregukitugamo.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/gosajokodilo.pdfIn PDF document text
    • http://szwygs.com/upload/87740901922.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c2472efd---lemufe.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1933e8063139c98cda761d3ecbd9813c/94084807415.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b239bfa5237---82586141011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+top+university+in+the+worldPDF 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_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 17016 bytes
SHA-256: 67daabbc9c37f3cd7d2532d77638146178047ed8a483130505b4e81869ad96d6
font_02_sfnt_off00013fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 10848 bytes
SHA-256: 9fc5fc75c6c656d68d2b98388aa7dc224694ba216c9e81eebe8426385e463b77