Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d2f5f2d8525d80…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 12:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d9eb40ef4e63f4ba19a79b6f5fe8e42 SHA-1: 141dc98b326048dcd78f55a4fc5094e775dbf9cc SHA-256: b4d2f5f2d8525d8019b54e9f1fbf8c8f04cd3c49f6f831f2fb1671bc2e78eba4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous distinct hosts, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7ca7986b6d460e1284179611b5c032ee/90606652379.pdf
    • http://clubmaniacr.com/campannas/file/68686598543.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160942d898dd61---zokabivojinedulegatotuwe.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/57460226562.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/nojoviniputotagetalesur.pdf
    • http://unicorn-furnitures.com/d/files/dumovadefumevokurera.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a226757362d---piwibiredino.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c7a9d54176db16bbbd93d841fd85621f/46073365474.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/68185789233.pdf
    • http://fishtech.org/uploads/userfiles/file/file/nubasetejagatag.pdf
    • http://gramercy-grand.ru/files/file/teguwaledax.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cdb23dcab---rimimewavefewi.pdf
    • http://btc-ltd.com/upload/file/vasotepeluxi.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9981b5a4c4---kowufexogibojel.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/49c4pqu1a12aurdj7b0bdasor7/79062304635.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3262d3cc---zeniwagatowutifef.pdf
    • https://bandai-k.com/userfiles/file/bejanufabivugav.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607601180ae73---puniwizuduwasaw.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/205f3319af6edd008215222c8d168ad9/31632622354.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/f368d06bdd41f1d6679a3057555adc7a/66484621904.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a7e09bde4525d2a896c22cf324173035/waworamijanifejapafa.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29593f534---17491052986.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc08511ecc---vomotosevavulenitifuneg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=german+currency+in+1923
    • 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_off0000ed62.bin
b1e6210397ca444852e6948687e5c244c383a8a41b40e2caabd6cff85cc6f9f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 10724 bytes
font_01_sfnt_off00010620.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 16792 bytes
font_02_sfnt_off00011e32.bin
f2f126818cacbb2a773d0a6ccf52673f2ed81f605f9faa3154efd3cf1160543e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E32 17640 bytes