Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e8e70e2f5f44c7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81f2868dba0b66e61588a78d63077fca SHA-1: 471a0abafd4c29d27aac10ce974b3aaf1197f241 SHA-256: b5e8e70e2f5f44c7486deb9d62fdb722fee538f13e1427550700250b19dd5f2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://caror.hu/ckfinder/userfiles/files/46624204025.pdf In PDF document text
    • https://agatanorek.com/files/file/mujipivek.pdfIn PDF document text
    • https://termofriz.rs//files/dodoborutulo.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/zupususinaxuzutera.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/68927672336.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/a8782795c052be30707723f89d9315bf/lofelizuru.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/wofilemipaje.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/binejidimizanixa.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/kokafufumikedafesifi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/aat9p45pl4l2v3u2q4oleiddbc/sanuj.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/6560183646.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a2356416b---pobumisipuputafugafe.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca5dedaceb---wuwutujuzapudaxokuv.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/74nqkj6sec1j7ljutdlj0s45up/35638601198.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/godutipukomofepewogikunip.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/73772750198.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160848724ae4f9---zoparutobefixari.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/62339429782.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8df84ea9f06741994a1236260d4c5f6d/26873973841.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/fumevogurepo.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/68667969977.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/kolilojasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cuisinart+black+12-cup+programmable+coffee+maker+manualPDF 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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 11392 bytes
SHA-256: bc8a49e4dfb32ffb8fd1d56dc19bdcb2adaa67aaded0cae21549efa00f8cb4e9
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 17796 bytes
SHA-256: f8cd74cc99527281f682444bf8b27c715dd7f360c82a4112f1c8dc90f99843a0
font_02_sfnt_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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