Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad703ec39b1a043…

MALICIOUS

PDF

94.5 KB Created: 2021-06-28 23:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4084bdf443689879e8113a35c8db249 SHA-1: 2c2d15bdc55e731540a3c700605b0bb449f4eea7 SHA-256: 6ad703ec39b1a043cd4f23ed005d9a4124810853ceade05fb7f7866179aa0cc0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607503c52e173---73979265897.pdf
    • https://globalmediaminds.com/uploads/files/nadusikilipasifizewakadu.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3fcee8b8a8f5d5796ffdf2040358cd73/wogitimiwuwurobuzapepak.pdf
    • http://absolutelyneon.com/userfiles/file/78076844788.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c02f1521---12811802321.pdf
    • http://greatnice.club/updatefiles/file/12675219668.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdeea8cec0---puxizasoted.pdf
    • https://verandapattaya.com/userfiles/files/vunana.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2480d6426---64588318170.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ri8sldjcta184a7g0pr402inea/buxesiwenefepigize.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/1f9ba87672f653c84f2f37948c5417ea/mewuzasesarareterajuve.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a69908b2743b145edc7d26dd0dcbe4dc/zodamifixatiliwopipazotan.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/cf02b4d8aa1534c3ae63bc142179cc27/9897671479.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dae7d5c122---31497069312.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4af0536c7---81917874937.pdf
    • http://beiwendq.com//data/attachment/file/96750494025.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8cba4d23b---zenazovakifer.pdf
    • http://dianacb.cz/userfiles/file/86235937672.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/l7eod03cdl5n8f8ma9qbnem143/55611962032.pdf
    • http://wsystem.sk/userfiles/files/98000762195.pdf
    • http://internationalnetworksolutions.net/files/jozawavudosapun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=dirty+text+to+husband
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f647.bin
e125db873ad0bd73d8a08c056b3835d7d632a10d1dccb00144d778371c385257
pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 18200 bytes
font_01_sfnt_off00012600.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 16792 bytes
font_02_sfnt_off00013e11.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E11 16312 bytes
font_03_sfnt_off0001541d.bin
99ecf97394a6e5b371c66f518df3c6984103482079c98910e5e8f27c0a4458cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1541D 10756 bytes