Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d3f8553335fbc1…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 05:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9fa13c99faff172570537a6f6e0172c2 SHA-1: 97367853694c941f0a0a79e71e668eca44525e59 SHA-256: 78d3f8553335fbc19bc6735305af738c060274d7f220c03fd0b365449e3e7b29
154 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress upload directories. These links likely serve as a lure to download and execute further malicious payloads, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5986

Heuristics 5

  • 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 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://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16090a216d118f---92808297509.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/a0cbd42bbce56bae159325700be8a383/wizejipiganurogatuxulakan.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/davojupuxetixax.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/qt5ghnna6nnuhcbkjfalen66o8/powamozexitodo.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/lamaro.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/wuloj.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/53595272899.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/88ddd7500ac7064bd2b7474ca2c252d4/20543112648.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/84403286433.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/wofovujajowagidel.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/94165231003.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/2dd8d54b90acf57f61ffe852f9b19616/givuwesaxigotatotinowis.pdfIn PDF document text
    • http://mopron.ru/upload/files/54573795886.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5muhrremgoohqre0rvjmmn3aud/walekoma.pdfIn PDF document text
    • https://topupdana.com/contents//files/64350877440.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/34377133378.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/53708117823.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f3924295a91e4a2546822cbf66f39c73/53551223157.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/kuzav.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e3c968faae4e04cdd473687b6b91b06f/babumipamavoxedixixali.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2534d51eb5ce078e368740012c4d7275/biferadu.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/alftqbhovl0lfq78arc5tjrqnc/19082064110.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072822e45421---kololunesimiro.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/ff3719d4f9943cfc693bc56d22d185e3/zukasera.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/97cb1014506b6e6dbca6db8f5d9543dd/84885989366.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3648eb3c623ffd383cd63bfbbb20a6bb/tuxunusowa.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075324ca1f52---85241464906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=siganus+canaliculatus+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 22052 bytes
SHA-256: 24fafecf505fe6693d3edad6d8d2e19a389b9b9e7086d0eaea0a29eac5b812cd