Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb31e620df68f43f…

MALICIOUS

PDF

80.0 KB Created: 2021-07-03 18:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a238007610c018b2218150d0a4f1785 SHA-1: 3b0cc60267a1b85973aada1f92dab80af3689aa2 SHA-256: eb31e620df68f43f1eb573738571bb06387c1991a32db6274ed9f51d8316f215
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. Heuristics indicate a link farm structure, and ClamAV detection confirms it as a phishing trojan. The ML classifier also flagged it with high confidence. The embedded links are the primary indicators of malicious intent, likely serving as a lure for users to download further malicious content or submit sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63e9eaca1---45231291659.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jmbe8c1fbfa3vrbcml873f6tco/34451727369.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/subip.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b075233e---91069256789.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/bbe2a48ab5497638146c931cf4060c2a/nokupunanezinazobipowe.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/famekodozoxa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff209e8cb---16211220819.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/a232ceb8e82e065c8611f8e764ab0bc5/gubefebikotovukedam.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/87389673104.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b98bc659ea05932100ebc4e693d96094/35068082545.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gudilemul.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/68191852092.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/g6mljt5c06a6ma6ltqbter3ij7/nusitanigokesanaferupibu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/dekesadanil.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d9ee2d5f8bbf8c95e2386a327e6d0cc2/66693655345.pdfIn PDF document text
    • https://efnnma.org/files/file/metibiweramika.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xixitafidelenikafilazilej.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1822b288a47b6531bdd0b5a2539f02a3/49781939012.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/8868c7b3da6cc7cb5c80564a9223b301/52168051609.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d915f2d488b---newixuxojedegi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca566bf5c5---fuwisugan.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0019daae---81725259529.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/didufip.pdfIn PDF document text
    • http://dhf-china.com/d/files/fofilujulebigivapasexi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9080241b97---rizemuvorodefoteluvixisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+does+the+mirror+in+harry+potter+doPDF link annotation
    • 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_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 10720 bytes
SHA-256: 914b281e7ac22e2b4f9e43caf536c3971e3b6f26518ebd77b4b37798dba71a5c
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16872 bytes
SHA-256: 9d79f654ece8a30b77777b1235d72a91a9ce22d8b4222f7e410949716664941d

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