Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0027f102a600fce…

MALICIOUS

PDF

78.7 KB Created: 2021-09-25 22:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6b3303133c0cdb73c036e745c2cc864 SHA-1: 88f7a6a6e12c5c02416ba9eff03a3c398cd127eb SHA-256: f0027f102a600fce9572f3aadd3047f99ceea035b71300292fb3f1c461b876c4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=change+from+epub+to+pdf PDF link annotation
    • http://aqs-group.it/userfiles/files/fadipufegozojarewuwote.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/53664127827.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/70928660195.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/51988329888.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/fiwabuvo.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/bedukawajubibulozifuzedad.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/weregaxegajojisiva.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/towozegabasefivijewudadu.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16320107579648.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d0cdbfd1a---gitebiwovagadanojosigaj.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/13525538038.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/bepudodiwefabipozakovob.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9d3f218---66645398029.pdfIn PDF document text
    • http://soles2walk.com/data/file/didibi.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/xunogawadujova.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/3778300871.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614058efe51e7---vejefogosep.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/topelujivufosasodina.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161404851dfaca---jalefagil.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/21856698230.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/11671265494.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/sulegevasunerawelu.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/76618145864.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 18308 bytes
SHA-256: c1c87c59e6742a9c61ae36a45970894e6afd6d0254f81b06db37a6669f54ba4f
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 10908 bytes
SHA-256: 822784218c3b38cd33c4c7456f7ad11f0c674b1ce9c61f08f29f452fd3a97f7a
font_03_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684

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