Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e2708a816ea641…

MALICIOUS

PDF

99.3 KB Created: 2021-09-12 22:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cc5d59307651dd7d002fe94559163498 SHA-1: 9800c24add9f6890c379f2d4b67294d4fce9e547 SHA-256: d4e2708a816ea6418b3625166a9392c8a81b547c4eacb754107b15d62a6c8628
176 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to external PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm heuristic and embedded URLs confirms the document's purpose is to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.pattyn360.com/upload/forum/files/xoxasafo.pdf In PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/41814496139.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/vuxigivomebugironosejimog.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/wasewizupesavebuwukabojez.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/wiwoneg.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/8147440157.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/85618154543.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/38804867782.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/72503616058.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130c13aedc85---ninanot.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/16152825168.pdfIn PDF document text
    • http://soc-in.com/data/media/files/71830707590.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/96b76d5ad8ccff3701745ed9dbb4ffbe/fupufo.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/folukebadezavarefaw.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210902171306.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/g0rluppvncdc84dp61j0qr3feh/10648023305.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/95732308921.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/5256746142.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/33168368720.pdfIn PDF document text
    • https://unitjaya.com/contents/files/57231338886.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161312c4a1e13a---vanediwewajesofowakaziki.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xowitade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=angry+birds+new+game+2021PDF 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_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13433 18536 bytes
SHA-256: c4d66b6f073021d41ec78b0b1390ef9d8530e33125b6dfd4e5310d1e26a92ba4
font_02_sfnt_off000164fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164FC 10944 bytes
SHA-256: 9412f0de5f0e8f4e31cb9192a526005060939eae2b57b473b0ddbb52806cdc0e

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