Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d92a688edbc924…

MALICIOUS

PDF

62.3 KB Created: 2021-09-08 06:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32b6514395f63156aacd92c4b40561af SHA-1: d2433ca49f6b3561e168c576382afee80f730508 SHA-256: 88d92a688edbc924cef38dd332bffa39855cfb4ac6297aa537984a88cd13a4fb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically phishing or trojan distribution. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

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://home-plast.ru/foto/files/kigulolifupememenoke.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48b2ca3a0---luviforowosina.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/fuxabujubimomikisi.pdfIn PDF document text
    • http://cartopack.com/Images/file/34296120020.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/jakijeletijugexavuj.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/76668298368.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29147cc8e9---duzinenorajosisumilixaxa.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021061720533273499.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/39790709028.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608437fd71a02---60059730249.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a5ea38c89ed19ec7f30a8b72ad26327/68875137490.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4a1ohhho05np4483jkpd65a46/gijirejukevokaziregujagi.pdfIn PDF document text
    • https://adium.ru/userfiles/file/ginotixev.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/josep.pdfIn PDF document text
    • https://koratspring.com/upload/file/90271994072.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/laxadikidenofariwun.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/67026877433.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/97942766918.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/57937292920.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/banelakujanezojosofep.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/8v7b9diqo9k3sapger947j0sj9/meligevegapexukejoputo.pdfIn PDF document text
    • https://suncables.co/images/file/44508193215.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/93015377233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=indicadores+ambientales+peru+pdfPDF 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_off0000b15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15C 10972 bytes
SHA-256: ff33a85824f19fc9d562464b290443572142ca6e4e717bf268a5b52a7a19bf78
font_01_sfnt_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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