Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01f6e0058a67ab9…

MALICIOUS

PDF

83.8 KB Created: 2021-07-23 18:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37dc72a0903a76a25e9fc9f647a3f1e5 SHA-1: 169e64fd7e8545f8a1bd54b60120e8e4c199aeab SHA-256: f01f6e0058a67ab9051abd817c0c2d429d7cf2ff7bc5aa317d5496fd2d351dcb
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://canxetaianhduc.com/images/file/xopafemusoz.pdf In PDF document text
    • http://www.peretprod.ro/content-images/file/zejilixikunalalikowufatag.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710170041804874.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3rg5bfs49799djvr0h17i8gk4a/numop.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/34300190913.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3eda77fc2520bad8c690901fa9571d0c/48757440939.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/m6f5iofmuue7uql6nna3k05i9o/fidikikofenazunabosubuw.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tikedezelota.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e19d8547c9f39e8021a3aae0048e10ba/10407180566.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840cb15efe8---85677553151.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd437b02e4---gepodimizugekowopofaxiz.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1nl5ck1cgu4iqfh2f7bvt42em/tikawe.pdfIn PDF document text
    • http://garderoba.sk/images/_file/72958659009.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/59502811489.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/5586757060.pdfIn PDF document text
    • https://successalpha.team/upload/files/jufevetunipuku.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/viwerap.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/23878063716.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5vf1l2fu8vrq8bin9b1bpk0u5v/vedinezelamanigapefav.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/57076594428.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/tujobubod.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/19075538431.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/74470043154.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e8064b38ad0a77caaeaa32302a13a3c0/27552501650.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/75806510272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=genki+plus+kanji+look+and+learn+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 10840 bytes
SHA-256: 08c69cf7cfab7501a2df22bf0468c061e4850cc19506ced7f6be50af6d21cf09
font_01_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 1704 bytes
SHA-256: b000ba784e06dfed05e5036781705fc03053f75fb86b6431fcd8f8bc5d31227b
font_02_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 16644 bytes
SHA-256: 3f9a8b4e0f5658c3f7d4badc9205afa7ff09af3817878b9f51fb9965c43ce561
font_03_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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