Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2fad16f46b8950…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 14:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e071859369b65372486c8e5c89eb819 SHA-1: e86b1c04c78624c9195571527ecf3c0416a74250 SHA-256: 0a2fad16f46b8950d1aa841cabdfcd85d3a76f39f9e3b350a3a139cdfb180320
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=adding+and+subtracting+polynomials+worksheets+doc PDF link annotation
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b609ce3b2---11591677658.pdfIn PDF document text
    • http://lg-palette.com/upload/files/44997833796.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/lesomabatasewegudut.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/tolikofaraxusorig.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/48009663157.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/pevazoradoboxodevoxav.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c48e2c34e---veradulu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4p73ub7f5iint1jcoqiafqj5fp/91634756587.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/loparuzexupupomidopafep.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/wefebumegesofilesosa.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52a50c3210---4141261756.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/suvakexawetumaw.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077c77b0d3f3---najikenaza.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/foliro.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/43417071542.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5a9edf2d---rogirorekomubugelesazeno.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac306ea40---dalezudumolox.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/kovutezuteroxuzu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c092350fd---82741505550.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/42238903095.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054a438fae---48565175489.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/gedifevovevobalusuja.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/kucsd2546stev6mm75u19p4q2l/27589416495.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/41873341376.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/diwedokonanuvute.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_off0000c5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EB 16692 bytes
SHA-256: 1bd76cd26f10020d19658795af87744d4ac79655b2ae52574b7ab28ad1fd682b
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 11472 bytes
SHA-256: cc0caf1d23b2bb55dec0dd670e12288ae2132107ded9a896ace20c98d2944556
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1