Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c55c21a4c530b3…

MALICIOUS

PDF

90.4 KB Created: 2021-07-30 08:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 664fc6ac685202dca0b567d6cfe19d8c SHA-1: 7ef87ae13907477a894a18d5b741cde312fb7c0a SHA-256: 80c55c21a4c530b3b26e6795a3c514dad779a770ecab84415a91aea4607fffb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://olivier-daulte.com/ckfinder/userfiles/files/59066263384.pdf In PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ema7dmlm9krg9g0lpcuv2ndhu7/34826174765.pdfIn PDF document text
    • https://plasy.com/uploads/file/94148880428.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/omrt9o5u86kkbm2bdk23h927a4/duxitoneravati.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/12475476408.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de4a16d2bef---butol.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/63771635760ca8f9b8e29f.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f6a6921eda350e91d31b9850c8059960/37612740492.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/maparuxevizi.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wopadi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f5c1735d3642466e9538286c85da8d71/88421487242.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/tovaxapezok.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a752cdd55---8481960079.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/31497612514.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/nepunixuwab.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/pezeweguv.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/felenezixidomodurefutarom.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/simedilazavuma.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/jekujinepawew.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/norexul.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176c2bfb4b---dimikizojara.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/37282596937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bajar+samples+para+virtual+dj+8PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10884 bytes
SHA-256: 10a0880e1d6787deaa0ad05b59b22181bef035f5fcb616839e4404b00b1cfd0c
font_02_sfnt_off00010a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 18324 bytes
SHA-256: 5f9b8ab79ac032a71145d87be86e1d579bcbe4fa0505a21801a53ac6a105b2dd
font_04_sfnt_off00014171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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