Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af361e29063dbad…

MALICIOUS

PDF

112.7 KB Created: 2021-09-06 01:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5232d24ad2064864db4852b5c971fd84 SHA-1: 3c1c32c00f1d6df566b8c0a42d8973ed47d459a1 SHA-256: 1af361e29063dbadf216466bb7f86def0fb1a228089c0fbb882967b587f9f422
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to external resources, many of which are hosted on compromised CMS uploads. The ML classifier strongly indicates maliciousness. The primary function appears to be acting as a link farm, potentially for SEO poisoning or to distribute further malicious content via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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 http://pvvc.cz/files/mezawemesogij.pdf In PDF document text
    • http://panteres.com/files/files/385810433.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/73291248121.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc02872485d---9633802447.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/30302485500.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c6b66334bdb4b51f629a927d0c97d840/5634187737.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/vegururuwisidaw.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/32ac32a0255a88a7edb76285e0e25335/33411312479.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/ravobuko.pdfIn PDF document text
    • http://drironcat.com/images/file/wopizifizipalipitexedat.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/kozed.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cdb22352e---34085640976.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/19376621147.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/lisavefetufelotov.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/nupataperodezixutolob.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/19bc49f5d7590c734dc6afa88562716c/bozinoputisonawuzug.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/52040482978.pdfIn PDF document text
    • http://kezmosas.hu/files/file/zolijajetoko.pdfIn PDF document text
    • http://bkmjg.com/images/upload/File/zabititikoz.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/45829260960.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/392611d1040f7bd1386dccad3a2f56d2/jaxewizifusigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mirror+sylvia+plath+poem+pdfPDF 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_off00014cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000164f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F4 10832 bytes
SHA-256: bb5ee243c8244b0704b7afe6787f447d664f841fd5a926ca3d52af8de526d613
font_02_sfnt_off00017e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E00 21504 bytes
SHA-256: 1d3400e5e7882d0fcfaaa048507f0d3d2c3bcd7f3a6e5216a1e1a3b245799b70