Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c335c26c981862…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 18:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30ec27835ff3a983944b002207415f69 SHA-1: 8f1e8f102ccf758162866ff5db08fd7ab827a44b SHA-256: 41c335c26c981862ed5131752e287577d12754b1eb5fb48aaa4494eeac865f8a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=sabiston+textbook+of+surgery+20th+edition+ebook+pdf+free+download PDF link annotation
    • http://www.colormotion.cz/UserFiles/file/misesif.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b24bbce5---76354376908.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/49752789896.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/kapawitusuzoziz.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/varorofuwikewewoxedune.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/30381587067.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/36339387103.pdfIn PDF document text
    • http://e-sheremet.com/img/2010707477.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/leguwejamajiraxovakofutig.pdfIn PDF document text
    • http://spbi.cz/res/file/85776134316.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbf801b00---66179130210.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/nuxewopumoxum.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/39077956553.pdfIn PDF document text
    • http://fpole.ru/sadm_files/xutemerotekopilus.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130433e549c4---47606691465.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/91345913406.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/datowavuminaf.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/86261204143.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138670cc3893---navetagun.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/60145130802.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/30070667746.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/pakirezikived.pdfIn PDF document text
    • http://darec.sk/files/files/6100941110.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/96040846193.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/19948489587.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/pajapojedotetesavu.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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 11728 bytes
SHA-256: b91b502db2e6d36025cef0de44090b442116644ec69ddf338ad0433ae4d24987
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 18268 bytes
SHA-256: af5b8b1468ba3b4228b9f1c47ddcf83d45b9559f45f1b0e9ac0580df88763ed9

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