Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6dd55394092322…

MALICIOUS

PDF

107.2 KB Created: 2021-07-15 15:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfcf4d177dfddb631631d95f13f376ee SHA-1: d43ad9a37f958ef7a5acc6a1c6295bafda12154f SHA-256: ba6dd55394092322a6c25a9b4faddfe6dad67d1ad4771861b0e1b816685aebdb
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting, which are commonly used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://arisutour.com/ckupload/files/73288707927.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qpr7oer2igp7oa9dpg322babu7/72968217897.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/82ea0a23427d5de3897f4b1c9c74bb0b/fekixefuzut.pdf
    • https://chung-pei.com/userfiles/file/tizutiti.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/hf6lhd4pk855abk97gho6h1v05/jipikewe.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/db84b96dfaa2aed9f7b48d3b6c8249bb/46128023074.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/7cdub59ir0phd22ou32lp7na2f/2604259799.pdf
    • http://campingwithconvenience.com/files/files/pozozizaf.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/sulolinu.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b074c45e0ce---20621324267.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/j3qj42a16k9hj7qokju25g3bbj/fazedinofoginaxemije.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e5a377ba451b35707e24fde8c2d68c4/tovafo.pdf
    • http://ztkammer.at/uploads/file/wofosakebo.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/1a4p3bcu82u662um0oj4ekbon7/85840600167.pdf
    • http://diversecityuk.com/userfiles/file/88718474898.pdf
    • https://clumba-indoor.ru/files/files/88647591900.pdf
    • http://questyme.com/userfiles/file/zoximepatumenepupogiwu.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/90559168810.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa044d2a68---40214277089.pdf
    • http://moneymaker-gold.de/files/79073297558.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a926cacc0b---10432444840.pdf
    • http://quangcongluc.com/upload/files/kogotosatinonoxiwozuku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=aerobic+respiration+for+kids
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ac4.bin
55f6fbdc5619e53468d14bec650fa76bf6afa0768777c1b0cadc3204cfe32902
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10780 bytes
font_01_sfnt_off0001338b.bin
e25a3a7f69b49125b782399cfdd7e513e3065a187da7cb21bf0ab99f6d166196
pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 1992 bytes
font_02_sfnt_off00013cb6.bin
c59143886648c6fa870e703abda2b8fa581a1f5847f25234bb41b2a3849f6ce1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB6 18648 bytes
font_03_sfnt_off00016e0b.bin
7792b1a1da77be3a8fdb4c138b1e453e3b459ca770672d0a43695268355f7229
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0B 16904 bytes
font_04_sfnt_off00018676.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18676 16792 bytes