Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee2182b117221bd…

MALICIOUS

PDF

69.1 KB Created: 2021-09-08 06:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c8f801bc11fd0603910e86932c836142 SHA-1: 14e14b71466d13ee041aa4190110971781e5e096 SHA-256: dee2182b117221bd40fee8e2da2bb3608a3e431af4822c0f1f80361ea66847b3
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics and URLs suggest a tactic of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://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://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_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
font_02_sfnt_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 14896 bytes
SHA-256: a2c20eb39f87ca9f5e53b51a5f2e6adce69e91572a440ba494db199bba9b2507