Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9f0557ab45bae1…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 17:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c79fe2cf9305521f2d85d4085287ad7 SHA-1: 7c072503d21942a484a8661429aa7f8e466156b8 SHA-256: 4b9f0557ab45bae1aa2e03ed084e0dc980a127e7e5175fe4b31496b3ffcb0ea8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=adobe+creative+cloud+desktop+app+full+download PDF link annotation
    • http://box8websites.com/ckfinder/userfiles/files/98976736824.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/bivigofawafutujikonavogo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610502e85a709---satisupotokedutosovopef.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nemebinopitomolave.pdfIn PDF document text
    • http://ty-int.com/files/files/pumutabetukedifipawur.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3da67d3d589568b64c376551e55a398d/15767615408.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b735ffa61afb09f7bc7b737ef4fd4024/65954590516.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c980d9eb1a---teperajobo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/549e2d1b4d3fd7f2039412011838b36c/dovukupisifewejepomubita.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/94392311410.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab93bd600a9---28381001528.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/zaxefujuganiketorinima.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/pumalufuk.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dde4f58d7277c2ae2125a455240c8a83/49452960178.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e2a3568d---35923032644.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/07fe2eee783d9f698d3e76f78f7514e0/xivamimazikufag.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03d630a61---59116861509.pdfIn PDF document text
    • http://secretinvitation.net/images/files/vidumowuwupozunituza.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/guwarogowufakipo.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/rowex.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/ce03d49e6497b52563f81b6c95f008bb/wamofunikopotedav.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/80959016629.pdfIn PDF document text
    • https://moolans.com/uploads/files/62016402647.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8356ded98a74fbf72c0e85b3b11277ad/83724071559.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/75892050182.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_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 11076 bytes
SHA-256: 09f5733ce81d9e9bca373f7e796c580274f402b0779355e189cfdd5c2ba6093c
font_01_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 17088 bytes
SHA-256: 93a85dfc2a135640546fe2717ca032babcce91e16514be1da2d35b2ed08dd5fb
font_02_sfnt_off00013945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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