Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c7187c83aafb0c…

MALICIOUS

PDF

180.5 KB Created: 2021-08-10 10:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2b7ee47a3925adabc1f4806c4d4da57 SHA-1: f559053b52b61408e38160ce560e12f2671ce1bc SHA-256: 10c7187c83aafb0cf8d82186e51070fa6211010c2c078c098566b68403b44932
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely serves as a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to malicious content or downloads. The use of compromised websites for hosting the malicious links is a common tactic to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5035

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 https://anandamsanyal.com/userfiles/file/lijebazodonage.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099663d9bc0d---mufopirubawanajaxaponuj.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/tafajutu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c84a80313---27229018429.pdfIn PDF document text
    • http://mosjob.ru/images/file/99006350206.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1f18da282805fbe944d1277c9cfc930d/30873315806.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/38271370277.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mifadivekagafod.pdfIn PDF document text
    • http://weingut-suppan.at/files/sesekinogonafo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/qka2bk4il9gphff4qbfoo3hc7e/90242778532.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/28af2incltqtlko6kr7d67anqk/10874318739.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/zorigifalafevitavopota.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zujufaliwafebuladevejufar.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/tagatojawodoluxominevu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/2596795337.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vhl246s98hd83v3e71ibap7ek2/88910089540.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/7234978254.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/zajixatosimobovaniwevo.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/u5qm1ic80t4gs11tos3ph25pkj/galuson.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/34562016525.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b635de1ad---kimanuvedegiruri.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd9b96bbf5---dexolawesovorefekexomone.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/1280451829.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bc08c9d75---kamowenejowawidubenunode.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b36gd8f06m3uqju3hp4guogk5h/didupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=after+20+years+comprehension+questionsPDF 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_off0001e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2DF 17800 bytes
SHA-256: 141f0e7e7341999ea997bcb8c1423c9484b3d25b275fabb7ed3bb2785fc442e1
font_01_sfnt_off0002110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2110A 11280 bytes
SHA-256: 13cb9b2e69b4609c45b90d989a851eca7b7a058494b9407f2d784ce8b5057f74