Malicious PDF — malware analysis report

Static analysis result for SHA-256 a373892763df3fe2…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 12:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fd6f1972c6e20b4a97fba0859e133e8 SHA-1: 2cc2fc16a5211e1acd8c0f0c13bfc9c5b9532053 SHA-256: a373892763df3fe29fc1f2bd79d7f28330538c690171120abd98bee3741a0bbe
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of a 'download button' heuristic further suggests a lure to entice users to click on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2011416db6---64753617217.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/65108090485.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/74032117e336b51aec42056a3fbd4e7a/41574401805.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca92d335a4b---rolinonivogamewi.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fe573b20---85687299322.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee273059d8---xadizusegufivefunifim.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c5723336---33947946850.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/58764580393.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ccfo43g9dgs7v29nek2c0n7p94/27250999439.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4521c2116---ronilirivewuk.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847e49863b---8167210883.pdf
    • https://cordovajewelry.com/images/file/xepajoradefetesabelu.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa80150ba---58361775316.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/nepekikovojiduweteruta.pdf
    • https://mimpiindah1.com/contents//files/33675706884.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/s5m63d3vh7eka6l8vgsa832nd1/manirokuniditugolofano.pdf
    • http://brlairport.com/images/file/21971854032.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070206f9c413---96692847397.pdf
    • http://ekotronic.eu/files/file/muwunazofimerinot.pdf
    • https://actor-conseil.com/files/file/19589960000.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a072d203f36---jolusesalejumefegi.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/209bae2febac334fc07cc8953c61706e/22788613122.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074b69a5375f---sofopesejonil.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=palmistry+for+marriage+female
    • 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_off0000ec13.bin
dcf004e43426b342b12483381beaedbbffba72b36781e84eb394eaef21d90395		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10568 bytes
font_01_sfnt_off00010444.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 16792 bytes
font_02_sfnt_off00011c56.bin
569ba479df48d2341b9beac56a2ad5290ab7e0e864ec2dee586d0261282184cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 17552 bytes

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