Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4e96e2cdbfdce6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 13:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40a9adb4ece549860a49d1966c8b946d SHA-1: 2977c76bda06779071a86593d9b6c521fe9d38de SHA-256: ef4e96e2cdbfdce6002fe1bed46f50ff9816cd56b0d6f5d54321bdb0543a6643
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external PDFs hosted on various websites, suggesting it functions as a link farm. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to provide a password for an archive, a common tactic to bypass security filters for malicious payloads. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crewmak.ru/uplcv?utm_term=how+to+unlock+pdf+file+password+protected PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s5ic5a974scnnjes10m1q4qmm8/lijukuje.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nopapiruk.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/zipewetikud.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/41410300284.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/3843916811.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/9138727236.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e2dfd9c9ded51621ab3fe19eac0e4751/rumaj.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/sojowev.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/tofidi.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/bovakatipijokezoxuleliwu.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/pexijipunigunenusuzop.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/61224607912.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/8410998618.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/januludesexomonuna.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i4kif503h2o6bvg05s1ij3b0h/74347608850.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/46135602294.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/19515581573.pdfIn PDF document text
    • https://slide-bearing.com/d/files/pesuximaxejusozajalororoz.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/23324935523.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vafikekadojasok.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/64c0131393233af54ad8551127ee2f71/95989897593.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/saxurejamoladolodiragitew.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34f54a4f2---46837154242.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///jitijegufewu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f5eb13a5---90183394189.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/tumewiboveseda.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 17404 bytes
SHA-256: 3961d6f3764743aa2b6b8b1be68258a7cdf8df0e62e1cfaa71ee5d6ba96503f7
font_01_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 10880 bytes
SHA-256: 24f991c2a302f485a0e7cd092b52336d2df6e103ea7fe10e747cabb2fd90744e

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