Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34ed076064dcfc0…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 21:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a3dac07afc2086c44668b62dbf8acb75 SHA-1: c1f28cb56cc9f54541d605f920edbe44fde0d8d4 SHA-256: a34ed076064dcfc09ffd8ca1d1da77e998c99c674814ac9ef0a58a6d7cce3602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=basement+membrane+of+epithelial+tissue PDF link annotation
    • https://tonitomov.com/picture/file/11963085179.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/ca281ef4a982d1b4d782e50cb5b12318/46779718753.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/gogulomanenejaje.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75cea7ac2---33893231089.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/b8ftm4lnmpa261l7ggap7q6k90/wojew.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/33db99ad85deaf2459ca418760656434/34878675261.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/wefefejizifirixefa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d3b563dafbe154f8b39f0cdaa56bc0e4/tazedixi.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/zobane.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b87698090---nosososo.pdfIn PDF document text
    • https://tonitomov.com/picture/file/kapukewoteletarij.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/lujixutadulixowofonin.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95a216ea96---38304268309.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608904e0698d0---kisinipifupidimijivuxek.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d940803a55---99414343303.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/de72318ccd9e56e8333f93d6e143aae1/giwigi.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/085e57c9331ff833409c3e1a95e7a86b/bubesurusewa.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/tusuluwapugekufolow.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fb1c713f1b3213445b3d700d7fe4bd25/nirijalogabivukata.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/14365536028.pdfIn PDF document text
    • https://coluer.ir/documents/file/laferonorumised.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6ots4a5hoqiso35b33nmj2oldo/mufaxerezawonazozerapabe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d8bb14a2---12910036531.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/lu88deq4uu189f40luml4na1cr/5350015564.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/faburig.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_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 16748 bytes
SHA-256: 7bb4bacf5ac700a5bdb48affc7927fe8a0d2901fc0a195873afcac51634e323b
font_02_sfnt_off00012fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDC 10916 bytes
SHA-256: e8b90479f31b57190fe8647e015c2f04b2f0cec44e90ce0165a23b8938cb65bc

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