Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deddfc0bf69f87a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 10:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c3e62b215df4aa548cee5723162d4d5 SHA-1: 89f4b70f5a5d0f473261ed0103393a4ab488d9b8 SHA-256: 4deddfc0bf69f87a6e6b040d2f44e8e2b7ca1684a5ea48fe2e3d64a4352532ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and link farm heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://merohamro.com/ckfinder/userfiles/files/51415630571.pdf
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/wubija.pdf
    • http://planao.com/ckfinder/userfiles/files/xepotapowuxasidir.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371b0413040---jefetekuruwi.pdf
    • https://pindimana.in/uploads/file/manijep.pdf
    • http://www.addvanceo.info/userfiles/files/xalonudekiruxines.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g9nbm7mp1b6dohn43g9i8i4d3m/13858464280.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f5a1b87fbed60dee7394ecfddd4e1889/21681083777.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4406e045---11342148597.pdf
    • https://mk-sito.it/uploads/file/jugosedimodazaboramawefi.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/wafebajamul.pdf
    • https://cochleartudaskozpont.hu/files/42902104167.pdf
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/52679332716.pdf
    • https://xn--interpeas-r6a.es/upload/files/jevezotar.pdf
    • http://testplanet.nl/uploads/files/balobiduzikake.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/7596622037.pdf
    • http://timnhanhonline.com/upload/files/jeviwanixuga.pdf
    • http://forumcutuca.com/ckfinder/userfiles/files/17504365625.pdf
    • https://officialbacknumber.org/editor_up/girazadefir.pdf
    • http://cioccolatogallucci.it/userfiles/file/78607819354.pdf
    • http://megamento.com/_UploadFile/Images/file/bajoro.pdf
    • https://affordans.com/ckfinder/userfiles/files/wolokupafiru.pdf
    • http://reopen911.info/media/file/xinurelomonopud.pdf
    • https://quangcaowebsite.vn/uploads/files/49206849920.pdf
    • http://assytekservizi.com/userfiles/files/35420060988.pdf
    • http://studioturina.com/userfiles/files/xemodomabapizafixejusa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nba+supercard+mod+apk
    • 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_off0000d96d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 16792 bytes
font_01_sfnt_off0000f184.bin
083c05915793fd6f3eb9cb60ad585e88770541386677602af99eee2d34e57e3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 10644 bytes
font_02_sfnt_off000109ba.bin
ecbe1b921ea0b4a09c434b9ffdbbf349b14f323fec3390321acc80f3d1a507f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x109BA 18016 bytes