Malicious PDF — malware analysis report

Static analysis result for SHA-256 678a6012a4cbaa8d…

MALICIOUS

PDF

70.3 KB Created: 2021-08-13 21:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9220beb22dd531f3be5469452f2164d2 SHA-1: 4ec3e13e1fb53bf5cda0ab5c09522e60758f1dc5 SHA-256: 678a6012a4cbaa8dc4a2dd6050a0fc7c8dc6c48156ed1cae604f179daf6cc660
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a network of links for malicious purposes, likely to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8477

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://allytemp.ru/uplcv?utm_term=how+to+write+a+cover+letter+for+graduate+assistantship PDF link annotation
    • https://securitydm.com/slicice/file/nunote.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/10540322496.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/jexur.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/50842752739.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b139684f7a6---21860442705.pdfIn PDF document text
    • http://4bx.pl/public/file/3221309499.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/aa4a25949d148bc926ceb70d32e8930e/jekomaxifezuwejix.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd108c5ace5430a4097be8b01ccc410a/mutuzamizovegibolujofu.pdfIn PDF document text
    • http://funperm.ru/content/file/gosokemumezujodo.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/25825241775.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/bimat.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/9365111656.pdfIn PDF document text
    • http://maryamghiasi.com/images/upload/files/metudasirakadofobudala.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/fusemadazobozifimamimurod.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/43070a7cd9fe1acb30478ca2a3ad4440/57532625291.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021080713315673499.pdfIn PDF document text
    • http://prograsifkalip.com/files/kilibixusokex.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/gejofimawavutozibogovapi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082f62a3febc---54068352441.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965bc5f37ee---13442017342.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5f3aeaee3---xifigog.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021062512084355.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cefd7ce8d---23829386112.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/krevstf8qsijk9e9kb56g1tcir/dajowivepaposijisivoli.pdfIn PDF document text
    • 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_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 16976 bytes
SHA-256: 83e368e6a24080944b7fc1c5deabff7b2ec026ec1c706be3a75d7769f45a15be

Open this report in the interactive analyzer, or submit your own file for analysis.