Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d88d50e803fdfe…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 23:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f993402cc254e4c1b3ca7e09bb6e46e4 SHA-1: b66f3d02f757fda94cc8b11a9e6fc1162a77fc52 SHA-256: 34d88d50e803fdfebd937fd8f5c5a2531f185d4aaa55ceb5b21b38430ff0fb80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, presenting itself as TOEFL writing practice material to entice users. It contains numerous links hosted on compromised websites, directing users to download further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f07dbd0a---jamivanigufupebupenivad.pdf In PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d5775d62---17805565402.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/40519313549.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/saxunajerumabenilupenuz.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0bf616468c---pifumirofat.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf358e51c---xuteniru.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/55632998847.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608345c8c7ec3---4740237031.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/70403018770.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/66873233756.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/sokamokotakugaxoboketigof.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/59b7196e920e930aebf0db438a6f3020/40918743627.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/45083307115.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/rebuloxagomilarobafozamob.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/69913916238.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/43113498284.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ad9be042---zepodatezilefagirutuko.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c9b06aee79bec69e066db060f71b02d1/55015054398.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ce0987abb07a13db52e0d0b496b639c8/duxofirevafil.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/radejolodonarodivagi.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/lopiremewaputusop.pdfIn PDF document text
    • https://chptravel.ir/data/file/32878954584.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/53708536934.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/sebepufuvosesatokumokodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=toefl+writing+practice+pdf+free+downloadPDF 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_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 18360 bytes
SHA-256: 9b68ab3f9fea63e21e9a300807c04a8ab82ecf3d1ed92fcf9cea6f863c9f4d08
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 10676 bytes
SHA-256: 4e44fed47423516c0d5dc5adae0ca12317a266c7829e168b442c3e1acc223af0
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1