Malicious PDF — malware analysis report

Static analysis result for SHA-256 11027a776f0d9732…

MALICIOUS

PDF

66.9 KB Created: 2021-09-27 18:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b23ecfc482d033fcd5380600a6e399ab SHA-1: 8380e3ddf8b9132c28ee31064a2cc2f30fbce58b SHA-256: 11027a776f0d973252a77f2f0b3c238ac3d0bd7ec62ec00e5e494cfc114c5631
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The document's structure, being image-heavy with minimal text, further supports the 'screenshot lure' attack pattern, designed to obscure clickable malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pistant.ru/uplcv?utm_term=wheel+of+balance+worksheet PDF link annotation
    • https://geneticapanama.com/userfiles/file/lozesuxetijezebaxumu.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/9497178150.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615074da467ee---6160375732.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/34619949809.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3491663f68bc34a23f3654aac2d9a773/49544144316.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ede668886---tonugusol.pdfIn PDF document text
    • http://inspeq.eu/public/files/40444806838.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/45592963444.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/39569981082.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/56596806624.pdfIn PDF document text
    • http://szhlfz.net/upload/fomasiwo.pdfIn PDF document text
    • https://pecsikult.hu/files/file/91529869849.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210909_d5909.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/purodegojigak.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-14/20210914102336509131.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/kosadorinikitivesifo.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/pifuwu.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/11376116522.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/ledazabib.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bea189fff---fasojavezugetiba.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_off0000aa4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA4C 10652 bytes
SHA-256: ed2f3dc8ef5e8f4ddb1c9b390a9c5bc050f4d116d29526f86cee62c20ad058d1
font_01_sfnt_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 14204 bytes
SHA-256: dea55c33f95e425782f5da7c0de5b01f9bc2cd6a53c7c7b3518153b8c1a36053
font_02_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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