Malicious PDF — malware analysis report

Static analysis result for SHA-256 3094beb95fa73ac2…

MALICIOUS

PDF

98.7 KB Created: 2021-07-21 12:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5725d49fb0da44ad2a1363349709b74a SHA-1: 97b4fd64a715bf0263ec9420f1b57fa8b655a884 SHA-256: 3094beb95fa73ac29419ed9a01758776e263bba725a7583b7e44641196981e2c
96 Risk Score

Malware Insights

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

The sample is identified as malicious by an ML classifier and exhibits characteristics of a link farm. It contains numerous URLs pointing to PDF files hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be SEO manipulation or hosting of further malicious content, rather than direct execution of a payload from within this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 5

  • 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://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/zufesaxisutoxoxujemozore.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607821016fc44---dupugik.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/25898815032.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/58367550703.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/nilomajefiledo.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/vofelovuvisesuravitilune.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/soberodesote.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09da07f0d1---xijibesaworugiz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5b6tin7ovqgi4stgjeimk8jt55/fosabufoperer.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/92558791867.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/lefinamosukibes.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4e6c52e0---54870464912.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa45d14a30c---26707692969.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae78f20e2d---92470898680.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/pegavosonasuvilibobobo.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/86282787812.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/67415647967.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/lojinifodukatilelodavox.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba77a0ba2---buvogurofovepuwe.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/laganenesewubikunuwe.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3be3fc1302---kilodoreselemewod.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f28eb3cdf---kirazosupumewuxona.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/wujakivipifafimifejuz.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/bitojadabiri.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/imrmj3ac67q1hc9hodukb3nau5/63495256920.pdfIn PDF document text
    • http://186086.com/upload/files/30885551987.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7maid22qel92ja2p6vo16s7ooa/50322440134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=change+voice+to+girl+apkPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 10672 bytes
SHA-256: 4849b3168277f9ddb6eea719caaddddcf5d7bdd11b1a82ac710e033005f014f2
font_01_sfnt_off00012273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 17232 bytes
SHA-256: 7180fcd0f3cb15d81f5b962f00dd3ea9cdc9ccc6888bb8c115038b534fa980a7
font_02_sfnt_off00014faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000167bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167BB 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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