Malicious PDF — malware analysis report

Static analysis result for SHA-256 71aaa5e355df8843…

MALICIOUS

PDF

102.5 KB Created: 2021-08-21 01:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea4318377b8f97bbba16fe82616270d0 SHA-1: b2fff6733dd81b90ee5dbbd7d2ec2cdab8ae4967 SHA-256: 71aaa5e355df884313712354f2dfc448640529edb458c1c436581d6ce174fc17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://ferramentabelleggia.it/public/file/58399985589.pdf In PDF document text
    • http://penzionriverside.cz/files/file/16153674690.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/dewadukevufuje.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jb7oa5im7mau4v39869alvudk4/tobuxikupiwuve.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/58314752913.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210523081527.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e952da22e---niloriwabe.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/bejiborezipatewuv.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/datezo.pdfIn PDF document text
    • https://topupdana.com/contents//files/favorijanezof.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mud3lhm920mobo0olomt5djuid/dozijefo.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/51398985669.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/guvibijeferisapapizubo.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/60881068462.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e16e4d606---nesun.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/efeff3ca764cd2f60c2b164bfeb8cb34/41960851186.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160719d995cfba---30808385700.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/rogudugoxa.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1d703d3b207a904c6fdd7bb2564d05cb/kezilabevorelitaxanol.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/cuf74iddsag02j3t4bmpfqi6v2/31336075717.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea4a82eb7---xusijukida.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5426c8f34---nakafome.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jixazuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=laborant+ve+veteriner+sa%C4%9Fl%C4%B1k+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular+pdfPDF 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_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 18732 bytes
SHA-256: a6f28d2f9fc8a8f304751fb837f2015225af15f24301051d68b8108b8daf5ce0
font_01_sfnt_off000156e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF8 11736 bytes
SHA-256: 49299b82c3dff9844e42e8bff4ec549c1148a6bcc6844aa72cbeee0c8549db21