Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6ec15c58b3a2b1…

MALICIOUS

PDF

66.3 KB Created: 2021-09-04 06:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 462b892efe9d011c52fa837f9a0adc3b SHA-1: c1c115b0a34c413d98fa5237303d0a004ba374c2 SHA-256: 4b6ec15c58b3a2b1ef4626ae534e41eb1e239ddd85672ebd75fb79dea8deae8a
154 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 ML classifiers also flagged it as malicious. Heuristics indicate the PDF functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8843

Heuristics 5

  • 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
  • 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://samtle.net/ckupload/files/tepufutegipevenu.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/84759946455.pdfIn PDF document text
    • http://pileki.com/imgup/file/43580029783.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/25630745521.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/4874238220.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/31386853183.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/r8tqlff56cpd17u2v3mvo6cnj4/zibubebal.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/5409174982.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/safurelugexonipafegi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8be335b6---38724847862.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a9237e29f---lobamaparekepadipa.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a006668d---vekepevolumalidol.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/vuroserediwemiribawo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/49302611323.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8d42dd08---868932057.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/58761125669.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/bbef208023d773aeef77ea295bddea7a/vukusazuwexufonug.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/40547274889.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0rir4j98gbst17bbvmh52k8t12/14132188569.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/73952757180.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/50a4e4890fc9d9364f8e9db640ee8c3a/62429977018.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0cbad5bbffded44493ddd5b09e0602f5/liwatesitujekomemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=adobe+premiere+pro+cc+shortcuts+mac+pdfPDF 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_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 10956 bytes
SHA-256: 7c5016492e75c49f7c34a4e2e98373b45ef45056754d297cbcf810562e55b8a4
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 17744 bytes
SHA-256: 397ae9f6271d61d9ee0bd149c6cf17b112358371ebea192a44a7e3b9ccbea0e3

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