Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d1eaa0ced0ca4e…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 08:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 93d02b9117fa7422c5e1b85618a8b8c1 SHA-1: 96748a104a0e7a5e1029d20960810aed25e40286 SHA-256: 56d1eaa0ced0ca4ebcc410089aa755092dec102ef0e5c2a850b6f8c918f073b2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicating an attempt to distribute malicious files. The ClamAV detection and ML classifier further support its malicious nature. The primary attack vector appears to be luring users to download further payloads via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5399

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.
  • 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
  • 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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d068a03c7---bizizivugatifaxoj.pdf In PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/92207771801.pdfIn PDF document text
    • http://seamacros.com/upload/file/53209086801.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/503g01mh6uk7j08igotm5a2vt0/57617851135.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/224775599.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/loxekimukoxuwajoru.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/58770347418.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/aad04cd424eb16f553c1a1287738e121/vunarizerixekideliji.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3223ac113d---56986891897.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/92883041801.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/godokowubujuxamefadori.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/28942726146.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/kozosarazopesinafojatojap.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52868e2af7---23801153323.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16116e47d23d31---putupatukozisetabu.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/94739ca039d5ac937e41aacf6f6a31b0/jododigupipava.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/08cfac5fuk23r08bmqvlapnjl1/83234177295.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9abade6a837e6bdfb9419d52e36a43e9/diluxitabupijotabe.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c57cfea467f---mevamavivedodube.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/81298406783.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/rikesilavawilajisarodo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379a233032---92037383567.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/dikemizunomuwuvogili.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210820080904474.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/46085967399.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/repepowewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=general+physics+1+pdf+grade+11PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 18944 bytes
SHA-256: c9dae8daa744f66a38531aaab019ff4e3c10b7b99995e96c294eb0d82d994f94
font_01_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1