Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a562e2a7e7a381a…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 19:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98c5675a5c4c0f60b28368b3b0f805ae SHA-1: 1a8cdd0ab51771fb20076c065271790e0c788c95 SHA-256: 8a562e2a7e7a381a5ea8d4b04f2969801c27c50510fe3f950bbe4e68c7959c55
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://allytemp.ru/uplcv?utm_term=msubplix+app+download PDF link annotation
    • http://brandiassociati.it/userfiles/file/xozedufetiwoderosidizu.pdfIn PDF document text
    • https://lazerom.pro/media/file/10743935408.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d2fbd234---74577389924.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/zabavivenixutajow.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/74450272365.pdfIn PDF document text
    • https://ysh.my/userfiles/file/witorabobikabisex.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vipudupubidigijebawotune.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/76811380720.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/35449927235.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/10618723538.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/41865057902.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2cf5843ca---mufeborikigufu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/02322f10c5cb81f808a322cdb31071ec/54292511526.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/s915bej5bpvf4cou5l8cghdc0v/10811705245.pdfIn PDF document text
    • http://zimmerei-possert.at/92996883548.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/26926846202.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf028d016a---jebuxejovebid.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/zufokuguwatovukupifadar.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/waximagiw.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/niripusokuk.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/tatorosexalefun.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/64371225136.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/kesudujesibimide.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wiremoka.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/basowameraj.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_off0000b546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 10476 bytes
SHA-256: a0598906bbb2557e4b12770759506dd9aba18db59b5ca3c05c686a83c70321dc
font_02_sfnt_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 17196 bytes
SHA-256: 85bd7f15f5c0cf6c34ded404fbeb92d7509ba85a2c01f280f9fd1d118ad1751b