Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a36deace150c7b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 00:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a355fb51c6c558141d0209f149452f57 SHA-1: 782c5a2443e43ba54331bed76b734f0abdca4d8e SHA-256: d7a36deace150c7b198f89303558b280c5b7e76102a2f287bee3012568e060ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://technoauto.jp/js/upload/files/67516103278.pdf In PDF document text
    • http://goodtraefarm.com/ckupload/files/nutivad.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/91224262499.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd7d0bdab9---77028864370.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ca7cbf4f3---tifufarajaju.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/i030ga6gcolgfa1pf60gag8tob/xupujutiru.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cea8ab9de4570bb46faab3f82e06669c/vazukotejuwutefonoz.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/53697665340.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6404702700---timogigusorege.pdfIn PDF document text
    • http://pmke.cz/pictures/files/3803493911.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4db9869a---40117210683.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/83114297247.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0rij5ql8q0s5s20tjjc8d96347/rizimubajidopal.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8dc1356c---73584733512.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnafa1j1eplof5j0ktm637v1r6/90740462289.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/zibogixami.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/18425601553.pdfIn PDF document text
    • http://haai.org/upload/file/pebekekubuxekirim.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160825f6d613b3---sojexeduxivi.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/xukiverowapo.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/66871796455.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/pujumixotog.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/2596887450.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5546ffddbd238f96615ee0e9e4368525/lodijurulededimuz.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/wetabibusovizidadikakon.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xovatutomuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tabella+verbi+irregolari+inglesi+pdfPDF 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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 20032 bytes
SHA-256: eea6dc02447d7f5e9980cec1ccc32275946649692d9c932a738153179e029f1e
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1D 10744 bytes
SHA-256: d69286a60f06dad183b431609af02ee6ca44099c958e0db032d8535f22b8cde8

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