Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f617ca464f0db6e…

MALICIOUS

PDF

89.0 KB Created: 2021-08-31 20:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 204b7e4c6be30f10fc7a47d2646ed669 SHA-1: fc2681e7b4414a30e268995617ba1da52d0feb37 SHA-256: 2f617ca464f0db6ecb2f139479ff4d6f4d12347649a1eb4d8a10b5f781b5d5e6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed as a link farm to redirect users to malicious sites, likely for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://cructi.ru/uplcv?utm_term=bouge+in+english PDF link annotation
    • http://veszpremlizards.hu/_user/file/31524560169.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5dcn3p6kllhrrn89cf3jcglrm1/36094347461.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac9bd1586---9412151364.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/41552706511.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/15514391441.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/77782090475.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db2abf362---fipurigufujusewu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aa080dd4757---nuxogogerivotutejul.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/vufabawimiwibad.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/52116809848.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/jomarolukegumad.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/93183728795.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/viser.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rosudelipofi.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/75422772697.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37f7ecf15---14834042975.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jq7khm17fifcdl2ab3n2gnkb54/fejasoko.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/sadot.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/buxubabobumosepeber.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b410448fe3d---funupila.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/74305319871.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/7340612633.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/penojasumopowubovewa.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/42432483344.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE53 22408 bytes
SHA-256: a52e9b9c951aa02a422ed6344d4ae3cc8c70162e1f56aab12811ef5839199b37
font_01_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 10180 bytes
SHA-256: a8121fab6bba5a256eddfa42c9655e4fb8c63869526ed2a7a2f56627725548c5
font_03_sfnt_off0001362d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362D 16272 bytes
SHA-256: 95d4440986743c051216f42ee3ffecc05a18eb268dc41e6efa4dca5ef6651b6d
font_04_sfnt_off00014c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C39 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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