Malicious PDF — malware analysis report

Static analysis result for SHA-256 953e2538fa301b75…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 05:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8f38a6cfaca38c035b0b88651d5a110 SHA-1: 7fd71c376ba9c8c3696710201a804371eb9f0b38 SHA-256: 953e2538fa301b751761334ad7f78354924c6b8e38b457f65cf7586f4110d662
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic for evading initial security scans. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://tecnicadovolante.com/images/file/26811320223.pdf In PDF document text
    • http://karcannakliyat.com/userfiles/file/91334067785.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zujiselalubamo.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/defesofafivavavepujixe.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/vebikaketufare.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/munikejunewabudefikax.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/36749055417.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/52011200287.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/15716087733.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vodiludofumovowob.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/41708038138.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/talegovepo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c499650c7---lakevabatenugu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/15186607239.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lolefukuwo.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/20617616717.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/wotatex.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/30372497518.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/48658768643.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/liluvujewa.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/doruzufidasenumidiginifir.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7da682b6981549045976b595997ffe9e/lejuzolisugozeresetositif.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/66383397259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=reset+android+password+remotelyPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e9e018833ea10c131e5376a46c710324/xijebowixe.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_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 18116 bytes
SHA-256: cf33d084bc9ab1f6675c2b4e1b1406d055505348fe64d005a5745e43dfb6072a
font_01_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 10796 bytes
SHA-256: 58ea6f04f9f2d9c2ecaa0d2e4563e67601d12f44f4c526d93fc6ca3d3f9f4326
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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