Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfb7b56b5d9abd4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 08:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2edcc5afe89662808379faa26913a9ea SHA-1: 4ce952ed5a95a8fb347fdf8949d9132e0b62ec77 SHA-256: edfb7b56b5d9abd44c91a3646e15a3635eaded58ae41240bc289dbd5ddc2018d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://internationallanguagenavigators.com/media/43248201406.pdf In PDF document text
    • http://cottoneauto.it/userfiles/files/9309180521.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614161ca2b4cd---ponapuwaxuxikugetoti.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/rujufikipilisofalek.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/votijiroso.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/72380904942.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614c060bb0c87---bemelipesefunu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1sa49fl31fduarc7vs42l4ek75/90699622732.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/morowu.pdfIn PDF document text
    • https://blgjad.com/upload/files/sazet.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/luvekadugizogif.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210922_110026.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bea2b64a34---wejoma.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161476073458b7---13410305345.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/janezofajix.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/vifadufoxoda.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/gijol.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613491ee7a571---jawovorifedilulaforamilo.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210908033050.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/49051318606.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zovevuxaj.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-16/21091620225617954446suh9c0nfuz.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/64271021679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=shoulder+muscle+anatomy+workoutPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 11008 bytes
SHA-256: aaba2880662484354e37ba463ed34913906ff8794ee4360b60750a285e65bb1a
font_01_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16620 bytes
SHA-256: a388eb593159c2097e2ede3b129c2479eb333f208aad0d833ac944e172b6113c
font_02_sfnt_off00011f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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