Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bc4209afaba525…

MALICIOUS

PDF

79.2 KB Created: 2021-07-05 00:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9d82769fd8b353c8f5412146486a9a13 SHA-1: ea52f2f2a9e0860e9271613187cbda0dfd56b9de SHA-256: 78bc4209afaba5258e93b8a722f007698c0c52cffd07a7ad3cd1fe648df797b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirects or exploit vulnerabilities, hence the inclusion of T1059.007. The primary attack pattern observed is the use of a malicious document as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609b765fa6d0a---xekuronojevaxujojigovima.pdf In PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/solojakekevezarugekok.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/10664857118.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cf173bdc58d---86447741106.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/tosale.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b23febea7---somiwakofoxizuberesax.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c799c47196---9316203047.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d512b60b---86177146239.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/rerezubekox.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/106df3abce3d83e2635066b8132888d6/47199854263.pdfIn PDF document text
    • https://clove7.com/userfiles/file/19347888782.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/zepapakuri.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8cf5e62b49643d72d141eda99cf80a98/36453500293.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132885d637---japajubajunapuruwilusirup.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fomatefidalevububunev.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-28/20210428205821327019.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/naganuvomiteposujog.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/16f933fff8ca1c475ca8df8247368f0e/rorigexal.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a729eaedb8c---13205756928.pdfIn PDF document text
    • http://goref.ru/files/file/kutamuburulobusum.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/42101ea84b04fa8f2411ea0b4715b898/49249201655.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6644d36cd483da41107426abd28bd2c1/dixamarof.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608513fe0b9d6---xepovetodudis.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/vapaminudexotasobusit.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a61e3be62129c17f184393dfdc84a868/35837738364.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/wisekelotanamugazeliri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ben+hill+county+board+of+educationPDF 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_off0000d000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD000 17508 bytes
SHA-256: a260e5131ec6d77731989f6b9b17150be7899d97c3196ccba983ccea993b0341
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 10812 bytes
SHA-256: 83a0edd4a5a0bab41e1b727ab734905a02f4f4145cac7b0d80b98b93f2ae463a
font_02_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1