Malicious PDF — malware analysis report

Static analysis result for SHA-256 43fa0bc92c8d199d…

MALICIOUS

PDF

91.5 KB Created: 2021-08-05 16:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e71fd5d17822349c6fec258aeca7a79 SHA-1: 32ea528a330c87fb22cab90abc7451d0b786b3e5 SHA-256: 43fa0bc92c8d199d0c9904635593792715883346ecbd9d53ec7087466947f0ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://candemdientu.com/Images_upload/files/7939772445.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40aab1c5b---66813245585.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6210e7f1d---jananivonibi.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/1905795296.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ecb364603---putinimabotilulave.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6e6ebeff---79326388221.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aab103344---93632125697.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/20502858437.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620925401.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/86266568350.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/38986676648.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/ruruvitifupebin.pdfIn PDF document text
    • http://chinalabware.ru/d/files/48979408261.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c51a0631---11319393908.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3931e01b0---gipimabarotebuwasubovik.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/46924886115.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/faeidgbuto9f959fs5b27qjahq/wofozidekuposubutakamalaf.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/pedojobonupagizegavad.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a856165f646---gugajajuxiwixejajexojux.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/weburokososasogazodawap.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/nolojaramuvalesipi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f4bd291993671f92e9c0fc20fdb0fc5b/sasebamixuxavatoz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b5e26c7f93554bd4b2d335b01aa30782/sonopavavotu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0l26krd46mk4usort52bboa49d/vulanisifibibotevemem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=momentum+and+impulse+review+worksheet+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE850 18324 bytes
SHA-256: 1da8bf6cd749641bdb9d3f84e98921ebd3c7afd806b386d7b39b708904228f3b
font_01_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off00012ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 10996 bytes
SHA-256: 1cf4bac01d4746d977dd758ac9ca70e1084414325f72c4ffed1c1a73a95111c5

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