Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a893aa431c8bc3…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 21:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f0da33683dc13b3d6a11d726eddce7eb SHA-1: 7355c245d1fee92d716b9b56814aba13c63679e3 SHA-256: 97a893aa431c8bc3ff7ec808cc0a7b51fe0fa1e4e0519fe62e866e030ac1b34f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a dropper for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161129d4ff41de---48848672865.pdf In PDF document text
    • http://cuacongtrinh.vn/upload/files/gojafososipuzofamanavib.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210503111530.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/bixovuxem.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/0hq50nmiv7nr6ad5p9u6t3ovpa/madakonokufeloredolab.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zixari.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/40456929000.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/diletapisogiw.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/bogetelanis.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf2751bb4---95127894668.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/84487606386.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a849f2f2764---83779703455.pdfIn PDF document text
    • https://wildnaturetravel.com/File/89917782584.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3aa47d069697184e67620f82ef5e6063/kusokanixafozawovuviwa.pdfIn PDF document text
    • https://chp-travel.ir/data/file/30061270836.pdfIn PDF document text
    • https://samowar.ch/upload/file/sezexusobagafegomojore.pdfIn PDF document text
    • https://seerupit.dk/assens/file/pikebalisuseba.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108240753584107.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/melut.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fg1i70t6orgt4n3uvogspcokru/luxujajal.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/sifabemelenokajavoj.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d59c04b8---49898749946.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/gurinasofexotuteribazu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804e7dc0bd6---65440306529.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/8694617225.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tosilugodilugavogewani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=liquidated+an+ethnography+of+wall+street+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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 18660 bytes
SHA-256: a3034bf618502be67141bb1ad41ad69093c87978ffdbdd9152832fb542cb8c6d
font_01_sfnt_off0001203b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 11180 bytes
SHA-256: e40836bea6fea8ac40604b559fcae0ab7009609e64a3c91473e4e6f37dd9e351

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