Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb370715409dad1c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 17:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c0854b17664809a54eb56619a9a69dc SHA-1: c816d400689d6382fc7d089ec1db76da7ca6c4cf SHA-256: bb370715409dad1cde9db70deb7e9587db1946bc4f3d0c76d2d5e2234d2e1d8a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to potentially compromised WordPress sites or disposable hosting, likely serving as a lure for downloading a secondary payload. The presence of a 'password-protected archive handoff' heuristic suggests the document is designed to trick users into believing they need to provide a password to access an archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vwtint.com/userData/board/file/ketudumitovujav.pdf In PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/4219327615.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/nevijire.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/panabodasasusuzodub.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/14072940837.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/82024557293.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/41619828163.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zesuxo.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/6547424329.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130461a05324---busizi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7f73c11a---wifimababumugebatujopimu.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/58595951670.pdfIn PDF document text
    • https://mikludava.lt/images/files/54031122810.pdfIn PDF document text
    • https://stotex.rs/files/42584051502.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22f05d2d1---bawidinisoju.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/42881464396.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/bovedoxudebalemifemos.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/putejurogikaziz.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/vizawexutefasemujawitavev.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/292nmh73k2rg8t3scqrq3ijqll/pulugafujima.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/rurizujejapom.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/xuzatinamodiremapumaruwe.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/13601885548.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/saronagipufudirale.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/37450309600.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/gixojikonezozeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+square+button+not+workingPDF 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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 17288 bytes
SHA-256: 8640790e79afaf198667de6226aab4086221ec61e9d3038a908014f79ea3b965
font_02_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 10924 bytes
SHA-256: 43eba023844a8f980f4d40f0874b919d7c43dc9cd8c089b044c6127a2e02157f

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