Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc7979bb8b73017…

MALICIOUS

PDF

85.9 KB Created: 2021-07-09 08:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f3e05ecffd07ed83bde725c21a5e0ae SHA-1: ad1acf8ab6e156b35d5bb39abac09c97f267d3da SHA-256: ccc7979bb8b73017f3b119aeb9cefa4778306900500d9b765a20773b94fb961a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to external content, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=nothing+else+matters+vocal+notes
    • http://breakevenpoint.pl/uploads/editor/file/20223399913.pdf
    • http://ototavandosemesi.com/resimler/file/darugelaxowebukaravedi.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846441c004b---junewukanarizuk.pdf
    • https://asthasupermarket.com/userfiles/file/gofitelenul.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ebfa1b7bf26211a969337d9d25e7af2f/kegivepumosenofujol.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/48778810027.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1ed1769e---zajomodinadi.pdf
    • http://aliceinformaticasrl.com/user/pages/26013709259.pdf
    • http://imreelectric.sk/uploads/file/liluruguzivadefe.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9f0edc5126b317fe19420655fcfdadf3/82379297897.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095b309347fe---wutakemelaliz.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a95ff4187068d416213e795cce09ea81/49883542576.pdf
    • https://cooperspick.com/files/24189245375.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c8daa7b8c90---47510186825.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/117df3317cd0f791918fbf13602379bc/supabon.pdf
    • https://vildmarksjagt.dk/userfiles/file/97819385250.pdf
    • http://olgapolyakova.com/files/files/relotazuzuxesedakafumi.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7199a61a9e---momamufuke.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd09f0990d---74273326064.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a994da3ca30---vanavasin.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/afccbf6c6c602c9615c97f3e2dec3825/31973493008.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e9d3ccae1cb97af299492d89d25cd5a/nuluk.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e00340a8d46---89014124670.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/rutodulewik.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3e.bin
0fe620fa2aa96a64851b13f6239c05987d88c9d323b1382906e08b415dd68ce2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 18480 bytes
font_01_sfnt_off00011a05.bin
bbeca40109c85f011f74669cbcf77693d5759157c028895e60c7e2ca4120cfbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 10720 bytes
font_02_sfnt_off00013284.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13284 16792 bytes