Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77fa7f00caff890…

MALICIOUS

PDF

87.9 KB Created: 2021-09-15 20:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ec5fee75c0ce2622ca6419a6d52b44d SHA-1: 46f7f8fbf4582fe96d8e0abda96675f8d40897fc SHA-256: f77fa7f00caff890c226b6b9ed15c394d9d049692c95f068160e6e433e01ecae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://fajndoktor.cz/images/file/files/bekurekofivedavu.pdf In PDF document text
    • https://haidangpc.com/contents/files/98178881925.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/13685323814.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210911123821.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/subemorofetuse.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/7437175986.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/15569011853.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/xemevefegorovisatakiso.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130347bdef76---gilesabixuragomotew.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfd216c4a---ketuvupopumapor.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/95610758656.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/paposikelajoletev.pdfIn PDF document text
    • http://csp.hu/editor_up/10668545247.pdfIn PDF document text
    • http://geasit.it/userfiles/files/28366768868.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/45971133827.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/vitagoviv.pdfIn PDF document text
    • http://toroisg.com/public/images/files/rebapalagujezej.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7c4c7bd9---67314100041.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/domujuwogevinunogami.pdfIn PDF document text
    • https://wineart.online/userfiles/file/90453164273.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/wovamapobapezufuz.pdfIn PDF document text
    • http://contelex.it/userfiles/files/meburuzumaguwi.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/27362913941.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/12579227205.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/2340370869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+last+lines+of+novelsPDF 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_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10224 bytes
SHA-256: b83d921e5f9eaffe6d5235f44a293c911dc301e7cafa89283cf2395d87925288
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 17920 bytes
SHA-256: 652761350aadf2760cf203ae3caf7820f911bb2eb41f2de493b4801c95b190e5
font_02_sfnt_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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