Malicious PDF — malware analysis report

Static analysis result for SHA-256 12eb03fce777c625…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 20:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 437f4bdc4acfc446d114ed7774dabf40 SHA-1: 5529ffc05948681a807cc25d9d03b4bbb55212b6 SHA-256: 12eb03fce777c6254b1e6528f6dfd2633b1891d50b6c0bb69f1a196ccdca0c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF files as links indicates a potential multi-stage redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://villatoscana-pi.it/userfiles/file/vixizazonozubimi.pdf In PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/84548133096.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/ponuxirafebijufoxina.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210907070937.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/28524722150.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6b539ca---83832637828.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/81358106000.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886d4c1c57---18135931107.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gomizijunamozejimobiji.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/65156265857.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/50955472846.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/mujepetosegujinubo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/311dcf1fab10c94f545f8196a6959412/wazekituzezikez.pdfIn PDF document text
    • https://dellrein.ru/content/file/27607422604.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/gidafipuwi.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/budopilevamaxupotabole.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/vijonoxadokinowujoxezeb.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/32373779991.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144a10774994---vuxoga.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/99142349001.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/jepewili.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210909_8E3E9BA45054D4C3.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210916071116.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/binadabepufif.pdfIn PDF document text
    • http://headrepublic.pl/images/files/xazadisivozisofugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+install+live+net+tv+on+firestickPDF 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_off0000b81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 10704 bytes
SHA-256: 71912969f6f6ff021404c330c0af5bd7c1ed6540e3c85e6a30f4660e09f81ff6
font_02_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 17676 bytes
SHA-256: be79f1f6abd924642616a3af37f56559a43195359fb27698b8a5af4e40f018f5