Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6befda5a4d9242…

MALICIOUS

PDF

76.8 KB Created: 2021-09-29 02:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1e46966388e301aac92dd06adce739b SHA-1: 0cecf26caeb23094b2c082ef0135fbb27a6833b3 SHA-256: dd6befda5a4d924293a7e914f6688593f1d575a901c52885ab2ef91170c5a11d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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 https://triatlonshop.cz/userfiles/file/44298144769.pdf In PDF document text
    • https://zdravka.hlpr.hr/userfiles/file/2996149688.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/18309160159.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/tuzidopojiri.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a9063f07379bb88a72a09485765920ed/wowirax.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/fitetare.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/81954690066.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/xumolewumemax.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rrilq577jpk7dtfg3uhrqgkmf3/86322352694.pdfIn PDF document text
    • http://momsystem.ru/public/file/tazitizipunolulexari.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c61b480c21f06fac5fb4f07b3df454c8/86095641498.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/39363133532.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd2480f3e9---jinanakojoseju.pdfIn PDF document text
    • https://angkalaris.com/contents/files/78652638181.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/40759120083.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/natumokiwag.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/7348581001.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/xokam.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/defumufevuwowava.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/boguwowudog.pdfIn PDF document text
    • https://triosms.com/userfiles/file/50112104579.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/mitodejururimunemi.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/95599800812.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-2/20210902065059545941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chrome+tablet+full+screenPDF 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 19320 bytes
SHA-256: 14ffdbcfb9a260e83acb2e7e68fd876e0010a4e963a5fb20df874054f8c8e7e4
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 10780 bytes
SHA-256: 4b0cb8c51051c17770e4a9c172ae5b7dea4fa99da8d9059bda7d61dc3fd573db