Malicious PDF — malware analysis report

Static analysis result for SHA-256 35365e201f2a4970…

MALICIOUS

PDF

83.7 KB Created: 2021-09-13 21:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1542966cc569e5f89ceda5b210312040 SHA-1: 4c91a69bc72a2e974356d675a8cf0359334a9958 SHA-256: 35365e201f2a49709a5b95cf1beb4e33c30a059b4c92696acd66dc42bbbac701
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to websites hosted on compromised or disposable domains, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of these link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tuvanthanhlapcongty.biz/upload/ck/files/78444301831.pdf In PDF document text
    • http://colorfusion.us/admin/images/file/24494569336.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/98456005740.pdfIn PDF document text
    • http://premo.at/userfiles/file/71570192266.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/5232447157.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/togikimem.pdfIn PDF document text
    • http://signauction.net/userfiles/file/27568077362.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///50634700470.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-12/20210912083032300819.pdfIn PDF document text
    • https://rotitelor.com/contents/files/71696296462.pdfIn PDF document text
    • http://gapp.fr/medias/files/dozupirikuvimopali.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a0f020b6f---17485703169.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fccf30a0---zekabut.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/7312393702.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/41622764591.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbskcto6sk2kps2qn1etd9n1nb/890907514.pdfIn PDF document text
    • http://centronegozi.com/public/21115847298.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/910674ed6fab04ed97cea5c31506f7c5/14125769709.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be46195a84---tenovuwimujatowan.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3170d427---mojedelamogewowigegove.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109112251336988.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/rofofarokakodu.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/31491761280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=my+visual+voicemail+is+not+working+androidPDF 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_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 18508 bytes
SHA-256: 4ab02fe1a852ec7f0a6748b69fe4bf2e41149787b1e305d57e66a4a373dc8b1b
font_01_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C1 11164 bytes
SHA-256: 2dc27b5d415fac8b76921c084d56266c0729a7be472e7bd713d2fbe967360731

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