Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f55e7358119aa3…

MALICIOUS

PDF

75.1 KB Created: 2021-08-27 22:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 523b0f38777d6bc1821574e90b3ec36d SHA-1: d7488e881208332f18bcbdd62720592249236531 SHA-256: 60f55e7358119aa37e0af8a4ad7287cfd51df3895cdadd05d64ad232c112f19c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, pointing to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage attack designed to obscure the ultimate malicious destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cahvqtd9ubsmp8nrb7ffupk1q1/lawofelematumupepobeviga.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/d671t4m2u3m8hdr86h9qoadte7/90114600317.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/zudorolujovuxizodogo.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbc9a46868---velazexejeludedonamesit.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/gigamemaberipepemage.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/34107056542.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ed17272df---nokizusajasifitisexizot.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/76729306419.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/ketometaz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b312af35831---binokolukogamekukunolu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609842a9ed57a---wijobinekemaluzosovaju.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/49411276130.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429023309270118.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb7b75754---jazosumud.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/wemok.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/73654820726.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608e79b949713---80230525304.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc93d57c56---36699297534.pdfIn PDF document text
    • http://hotstamping.pl/files/file/sikapovabap.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef53553471---jazezutejerudobixirigixag.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e1c4db050---52293169354.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/45645482889.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/jasekukuf.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/6257073355.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/pawupofaximidi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fa61d8648fd4fc576228ec182df208ee/roboxozukowukupegezuxusur.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/7d2cf8d43d8ef646c6ded9e4c65e6cd6/lenupakuxazutoxananepowap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=national+threatened+species+dayPDF 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_off0000c49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 15932 bytes
SHA-256: d622c2a5048db01420dc40e1ffc92db4f54da36b54fefcf771bf9b87add05785
font_02_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 10700 bytes
SHA-256: 39ded11e4f1b8baeaf747c1bc034d26ca5438095b25cb987902e7533a72c3e39

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