Malicious PDF — malware analysis report

Static analysis result for SHA-256 671ae24398408d72…

MALICIOUS

PDF

87.5 KB Created: 2021-08-07 06:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdfd9a00b0b9fb64e821aca6b9b4afb5 SHA-1: 9ba59c81e3c3e440ba34e18110607d6a1448de61 SHA-256: 671ae24398408d72107685949921492db51e7670956db924aa5c9b1d3c587e0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to serve as a link farm on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8f81515d---76267451808.pdf In PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/nejokisune.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/62033826149.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5302734b7fdc7ee5f2530e4829ca776e/zavuvufufuredegiwusex.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033e1e6ca0a---tetaraja.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b424ea0d2669e322bc6a4acf2ad9515c/derukijurawogagidoti.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835ffd42b1e---jotenivitugazatudexa.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/41722317402.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/jagodusoni.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/90814727412.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608138835b8a6---mapevima.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7769c855---33992385793.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8469d2f00---pujine.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/63051405008.pdfIn PDF document text
    • https://primer-spb.ru/files/files/77633412473.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad61d506f0a---26563604022.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/jejuganunuwikujalunox.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/5754289776.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/mozixenuwewalawapezix.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/rosamizukuwelunimolori.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/rabalunux.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/12622941552.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b281899758---jolanodigunigufug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=gordon+ramsay+ultimate+cookery+course+recipe+listPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 11020 bytes
SHA-256: d110f452e7f4e6f4e7ca4453d4f1b915c327a217b87c1b64a4fd62a630418eba
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 17940 bytes
SHA-256: 4636d8919826c94d108db8f9a209f232977c7aa1347b327f8a6221ed2c633f0b