Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fa1a83953295f9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 18:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f5cafa0796e9a2fd4e349f4fc1e118d SHA-1: d7cc5e578ac8f80d59ae91865645dad195384965 SHA-256: e1fa1a83953295f9b29be1a122802bfc0f323ad020cc961709ea3a81bc627574
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=contoh+soal+vlookup+dan+hlookup+beserta+jawabannya+pdf PDF link annotation
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d0dfc73d0---60838880197.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///90186402481.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/44012338485.pdfIn PDF document text
    • http://nkland.org/userfiles/files/xuxumenibigo.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a35ee018d5f16fc92d67715840fbb6e3/66602977410.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/48890783954.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/2384631563.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/4586236319.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/gugojeloregevabu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ivv6nha39bte9ambt8rbn16ks6/86807332382.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/99324474671.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9knfmlorcj0giku9hbas0c3ci5/vopesegakenub.pdfIn PDF document text
    • http://yongqingtech.com/d/files/rinikuwokowofepane.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/37728242619.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/5bb75b8084e55608f82d1b79a2904bf2/revumofodekemuzaruvejefo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/98926896022.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4fd2948b0838de81d878db4f0e518b14/mireruzepojitazo.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108180842523658.pdfIn PDF document text
    • http://ktcz.eu/files/files/17575949753.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/96284331711.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/komow.pdfIn PDF document text
    • http://billsky.ee/files/file/tujesasoluradatope.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/60353679450.pdfIn PDF document text
    • 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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 17312 bytes
SHA-256: 4c322b1781c94afd4e23c7a5bcef28623939ea5d7392c13b3c77f5b03bf05ebf
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 11264 bytes
SHA-256: 5a44ac80f4594d02bc437be722e9422baab1ceeceb6543149d0bac089874bdaf
font_02_sfnt_off000115c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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