Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b21cd0244916832…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 09:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a6c245f746835f42963d159586ef79b SHA-1: 2f804705dc94701a395a80c9adaa5efc01e05475 SHA-256: 0b21cd02449168322bff1b30f90e8d866d8b98fe1ef01356ed32d0b09720728e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to external sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=how+to+link+one+activity+to+another+activity+in+android+studio
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cee7599d---43245627030.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6e13568a---3583057452.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/51436391469.pdf
    • http://klm-co.ru/foto/ck/files/dilizigafisuwubawafi.pdf
    • http://massimosusto.eu/userfiles/files/mumadenefakotid.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d403c3da---xapukubetujesinon.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161362672d4d5f---7865926176.pdf
    • https://butagallery.com/userfiles/files/tawimojuzojojole.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b4873c51c847c645a8f2f43957880ed7/92297025181.pdf
    • https://mimpiindah2.com/contents/files/vatineluxebaxuvawasabadi.pdf
    • http://playoz.com/ckfinder/userfiles/files/64850417708.pdf
    • http://dienvietbac.com/uploads/files/mezewojudujaziwodituje.pdf
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95741115715.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161358b6003281---78526597926.pdf
    • http://sevinctekstil.com/resimler/files/fujarozugus.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/97718485124.pdf
    • https://chptravel.ir/data/file/xaviwivufel.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/rupagagapojutakakejuno.pdf
    • http://edilgroupdigiovanni.it/userfiles/files/bukifafufasupafofowati.pdf
    • http://vattuxaydunghl.com/userfiles/file/69875908847.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9c5a34bf0a9f32639287db5c2aab1b07/pazijeperadegaz.pdf
    • https://essuances.com/ckfinder/userfiles/files/betibujujuwebufoguz.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e182df537---rexepibovurizoja.pdf
    • http://langeline.com/ckeditor/upload/files/buloregutowofulawen.pdf
    • http://whatifitspossible.com/ckfinder/userfiles/files/fedisitaxiwupirufililaxa.pdf
    • https://brianspradlin.com/userfiles/file/polexefadozosozodazotix.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/27467873770.pdf
    • 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_off0000ebe5.bin
2756caac7a842f0f84f4629f114997b99a5dd810eeb263bb8322fae771a4b490
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 19080 bytes
font_01_sfnt_off00011e0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16792 bytes
font_02_sfnt_off00013625.bin
369723a8cab3393139f7571bae17ba7218ba1619c937bfe938bafcfbbe39a026
pdf-font-stream PDF embedded font (sfnt) at offset 0x13625 10916 bytes