Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b5d7d78c82bc2f…

MALICIOUS

PDF

100.9 KB Created: 2021-09-03 04:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7794429fe39b996ece926b21c9d39f2a SHA-1: 6ebb4a875c361e469a0945fc2780624c26811ba4 SHA-256: e8b5d7d78c82bc2f62cf678ae2e2436ebc59bfa6500f1ac147a3e1f427d2e429
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure are designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=poseidon+family+manual PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7a8bd3e1c---xatotonuzizer.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8er1cq95rvqa91g7pcfci547mr/guganafasiferago.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/87726649965.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cda7735f5db3284b40f324784b80d2c6/16687875905.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/bewox.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/turafifejitanibi.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/7161351767.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/v4jckbjbaqgmjklpff1jj0f6mp/52801159474.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/fhsevvd0ercd462uq8n5jiaj41/lovuwawaselej.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/46555383398.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/nanemomigugigurixaxumela.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fd50391e---64576859925.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd621ecdc---dukusufilimefufoz.pdfIn PDF document text
    • http://ned.ru/uploads/files/78811227850.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e2884115---33307123312.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712bc483164---14030940314.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/99d517ccc59e56176ffbe06538c8a0aa/jegodugizowakexaradobis.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7a5888965a0dc8a7df21373ffc815ccd/79085106546.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/33760984753.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c6d8dae7---61462222396.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/vikubopixebevutefid.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bobezusafuke.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/magexupisozatemetu.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_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 10532 bytes
SHA-256: 5108db5d38279ec45765f1fb313b0bee92811fa2fbea89f8047fbb69a8f4d192
font_01_sfnt_off0001320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1C 22940 bytes
SHA-256: 24caa1e6f075c66d04750ee55d2884c4816928ec33953e191723acfd341b949c

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