Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01cc7f58468875b…

MALICIOUS

PDF

90.8 KB Created: 2021-09-05 23:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ce48f56d3dcd6e5c3445df9348e67bf SHA-1: e736db0e1ef688f531d13130efb69c90dda2fc34 SHA-256: b01cc7f58468875bdc36f3591bccdff6783ccb569a2069b3b05a5a499166a3f7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, likely to facilitate phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=captain+marvel+script+pdf PDF link annotation
    • http://studiofapas.it/userfiles/files/powaxatojidesapifikesokek.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1a46c04---fitejifaritejovo.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/nosatunajejepita.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/5unoij8sje74fn8rf4c6n20000/82706383896.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/medamagotumezuwegi.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/poxuzodubupovav.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c248167b6---5127712869.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f503401ac1---29253424555.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/zapanefoxufewul.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/18088728143.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2de833df6f---gixaxepuw.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/3646587278.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/echi5p7n84hlv5haj5e6vd3o87/49393425105.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/30c883dc120bd7cf116541a9f0881281/zarakanidarawawuba.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/36931352315.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/49260042593.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/89521000972.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/vifoxudabuketis.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d7c2c7934---tezowiguwawil.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba27d853113---86764990761.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210808002825.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/08ba4583179ebbc9ddccc3609a7f27e8/64152047437.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/safalitujaguvowawibonak.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_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10756 bytes
SHA-256: b37b77d4e6249d82e539a896ccdbac04de9a96a14cad8ed6e3e75ae7ffc4c751
font_01_sfnt_off000117c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 18060 bytes
SHA-256: 460e094b93496d52dbe6b6c9314fc55bad2575ea8ca3d284661ed98c28c82cf2

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