Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cce3673b9df24b…

MALICIOUS

PDF

83.9 KB Created: 2021-07-19 01:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 092cd068485213ccf46d3f912f4b9fd9 SHA-1: 6197d960fe0af4037e756a4957774a1bf8b71da5 SHA-256: 22cce3673b9df24b431760226c1690dc0c47726543763ed9b251dfecb7e54fef
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm used to distribute malicious content or redirect users to phishing sites. The PDF structure and link farm indicate a likely spearphishing attachment used to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919c11af49e---5862839903.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089227d57a68---47208326296.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807576ab380---zisene.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd39f9a00c---ritezebuj.pdf
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/51306404401.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd78b7faf---68001691415.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1c6c600039e43d4a743d4a4da3ae543e/46739032561.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/kidogokapilugifejuwi.pdf
    • https://hitpoint.tw/userfiles/file/35518528057.pdf
    • https://alshaabcoop.com/userfiles/file/14681614013.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8bus97t9us75nmq744195ufuo7/16687942473.pdf
    • http://ateliergermain.net/sites/default/files/file/87360387020.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde43825a40---39558724951.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//pogin.pdf
    • http://allprintusa.com/admin/images/file/nenowesodigo.pdf
    • https://ajitcoatings.com/uploads/86646193486.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160741dfbe2a8d---gisug.pdf
    • https://calendarsunrooms.com/userfiles/files/pajipeweredoredodawajudep.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/bapugevelofufitesu.pdf
    • https://renault-service.com/userfiles/87586572673.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0d3395fbbc614975fb2aeb2e8d4394a9/siriteliwamivubuzakib.pdf
    • http://pathtojanna.com/userfiles/files/vadanuwudop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=men+and+intimacy
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e697.bin
a51a0093bef64367d365e053b322362b5c39acf7799b8ec0d49083af43baa963
pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 17324 bytes
font_01_sfnt_off000113be.bin
25e830e6abac182aed2ec48974b77da2c6dff9fed73e0537838358b2e40ff86c
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 10204 bytes
font_02_sfnt_off00012a96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 16792 bytes