Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e9674820b2378…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 20:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4be91befe26f16f15b1183c0c1fb10b2 SHA-1: 7a8250a454576d41520dd01899c8793bf47df1e3 SHA-256: f52e9674820b2378493ee63a8938ae4db929abb75fa38805c715cc442d591406
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of linking to potentially malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6759

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://apoiotelecom.com/imagens/img_fckeditor/file/vuxetofo.pdf
    • http://hungthanhauto.com/luutru/files/38055385216.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/24114941004.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/194e18b7d95bce77871a502ac90ef534/jumoxor.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/4940536137.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/h30o6la9eqc1fkqoe9b82pd1v1/surolojujex.pdf
    • http://metalzilembo.it/userfiles/files/13231922686.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p1botdjre25h95qqldaiblqh2q/wufidubeviratok.pdf
    • https://mertlakustika.cz/images/pages/file/vetodufezejuxigi.pdf
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/jabaloduraga.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089011167b37---zimodolesanigutonu.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9f797021b4c5d7c821f9c801841ac7e4/lolagade.pdf
    • http://www.bluewhaleline.com/image/upload/File/wetujetanibod.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/901bd10909e5714f6af3e37729be757f/23596672969.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cd38cddd04fbdf0548a7ae9f1dded22/buzaxixizotexofur.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ea78f0f0---xezejaxatovotab.pdf
    • http://szolnokepul.hu/userfiles/file/nusoxikejo.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749700735cc---jaxudabikaxuwamun.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/49uqk8hfqpia61l2s7nbvcf5a3/dadigu.pdf
    • http://babamoleskine.com/files/file/sudutojided.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tt3emotm8ggqgbkaiomqi0nvm2/modalavitunetorelajulo.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/cocmah3hmsh1ucrvj6p486e5a0/88642412246.pdf
    • http://findusafranchise.com/files/files/nonibosuf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=survey+questionnaire+about+effects+of+technology+in+education
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001086b.bin
7f2bcb9393067491408b0eb3f047daf5ee0476ec5395b23a5d05ed91425dd977
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 11396 bytes
font_01_sfnt_off000122c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 16792 bytes