Malicious PDF — malware analysis report

Static analysis result for SHA-256 190fc2bfc4c49938…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 05:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 007c5eefa1784cf18774f5fb415a8112 SHA-1: 8e015b2e34f724e36997c21af860a95dae024b42 SHA-256: 190fc2bfc4c49938d2831dbf5cd574163dcfebaeca7b62641de24248c7f96623
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9494a38eac652023976ac6bd6153cabe/kabeboxirotefi.pdf
    • http://babyindex.nl/images/uploads/37823419286.pdf
    • http://vizit-k.net/uploads/editor/files/bataja.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/bumugaxike.pdf
    • http://upasamed.org/Content/uploads/files/69138821974.pdf
    • http://attlas.center/userfiles/file/29949201062.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/sokixakuviwuvexadojifudi.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d4336ef61681c25652c406c161f217bb/wigarikajova.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161394d455d82e---ratugazogegimuvamebatos.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/42546770891.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16139ece51d2c3---3638197228.pdf
    • https://norservis.com/files/files/duromedovutotosowabal.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357ecb1c381---voviluwa.pdf
    • https://soalmatematik.com/userfiles/file/69781408509.pdf
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/lerumaruta.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/sisabekidul.pdf
    • https://vialivonica.eu/userfiles/files/kaziwepebopoloxed.pdf
    • http://cariboohose.com/userfiles/file/37111201272.pdf
    • https://weboonline.com/ckfinder/userfiles/files/54668335605.pdf
    • https://radio-aurea.eu/files/file/1097110756.pdf
    • http://marinapogon.pl/upload/file/22681130272.pdf
    • http://tokstar.com/_UploadFile/Images/file/36542789906.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/64735786003.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fortnite+apk+for+ipad
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 16792 bytes
font_01_sfnt_off0000f151.bin
f9a8e17ad4ae7811fa3a7025cfaabaab7b64a82b2aff4755f431936a64699f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 10348 bytes
font_02_sfnt_off000108bd.bin
f7ed6f04d8d4227d434a174ac14cf9c2807ee999b70e20624187366b960b9a17
pdf-font-stream PDF embedded font (sfnt) at offset 0x108BD 19876 bytes