Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed0544fa2b1fbd7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 13:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 81f49ff0ae0224e18fa1d8aa2b66cec5 SHA-1: bb179fd1e4330a5c47c1f264a59a5dd010e8dc59 SHA-256: 3ed0544fa2b1fbd77aa8c7dcb8df8b208b26f07e585d4fcf064e5312ad8f7191
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs likely serve as lures for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=gordon+11+functional+health+patterns+pdf PDF link annotation
    • https://office-agglo-larochelle.fr/userfiles/file/88902277698.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/70259022682.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/viwototidokujeri.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/nabopomitevetipixatebiven.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/34785111932.pdfIn PDF document text
    • http://spharma.ua/files/file/wadutozojogeb.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/mudoj.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/pivimutigazovutepuse.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/24814571299.pdfIn PDF document text
    • http://nemalipics.com/5896311066.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/55138082502.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/puwizotisetobijiverinopu.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/fasexivudi.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/ditowapaxivava.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/24816225093.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/tabapa.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/fimejawugiwefazilavex.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef7a0038da---96882599184.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/11300382342.pdfIn PDF document text
    • http://unsersohn.ch/images/file/18310118994.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/71067211169.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc487628c5---dujowuxozapofoku.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd38a1f46---dizeti.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347000d7af0---puzazulasolig.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/25113294444.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/wonubewikojuxesadorovove.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_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 17020 bytes
SHA-256: 37488e937928d2dde9304c8ebaa05fa24bbe55032ce1e32861e0427446bc123a
font_02_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10908 bytes
SHA-256: 27d35774623db1d47a3f45ce89c3750a3cbc1d59edc6932f379debd9c4ea00a1

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