Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1625ad31a15d06…

MALICIOUS

PDF

97.1 KB Created: 2021-06-30 08:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f41b9a657199483b5d3e346d85803652 SHA-1: 5b5b08f1a25c97a0f1ff3dda0eef3140cccaf079 SHA-256: af1625ad31a15d06f0ebfa98b4ef044d4f4168f939e1bd496b352f6cd563ee0c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document likely serves as a lure to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://amirep.com/wp-content/plugins/super-forms/uploads/php/files/756cda39eb2433221b083f9d39520ac0/kozavolazosab.pdf In PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58e7fc6e27---dorasegomiwavuxakogipule.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/155c27e6e33a43b91d5fe7f5f0485b59/bogowisatomuda.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/dafekufivuveboxeno.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/64e2f980914d30f5218d82e572b81c62/42332641525.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/161754dfa0fed1b14c892691a01e4640/rerotokawuzutofarib.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/mitelimabupozevelatu.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xogoporesuposozupifemug.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24d9a58c6---voxixix.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839ca2abbe---68800105835.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/eb701dbbce83aca29838bfa5f06f8628/14740870000.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nawinadakobolaren.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/aedbf9d4883d6d3da6d32f5707cbaa58/tubabuwizadat.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d5c5a843---tuwivekudetidokevu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c835b937cbb62a0ff510be0ac963ee8e/roxagujukadevorigam.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160758f9a25e0a---61436037796.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/80b1d5e642a63d5b29867ab68117bc95/labukakuwukifijakutidazed.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/43975716867.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/ziremowukobufilabipajoxux.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/db49c1e9c4dee26357c1197b9914fd19/64161053451.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8ad018ea---woweremalejakop.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa15a24ae---85552198089.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/fad15fd99dfe5b7ee43829e09f066905/saxususakivuladep.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/44401425359.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/1j0qj4qtmkq1kf3ku13ki4pfgl/madogeloga.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/pujojajo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=answers+impossible+quiz+2PDF 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_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 17924 bytes
SHA-256: 11403f3bca8c876663495402baa2cfeed53fb6de210523afc0674a47b03c6cdc
font_01_sfnt_off00014669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14669 10788 bytes
SHA-256: 178c004dedea3a7e89a5f3cea692ed2b9800c8abbbe0ba73cbb82e164f6347b4
font_02_sfnt_off00015f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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