Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1db995aa3d46b0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 16:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36bdabef15da810649282c279b5e20d9 SHA-1: 61113735dc84f1e79d1a18be477f450a28f2951a SHA-256: bd1db995aa3d46b03e63247ee06370eeb978f00d428a065ea97eb31caeee5e12
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, consistent with a payment redirection or bank detail change lure. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the nature of the heuristics strongly suggest the file is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://5m-tti.com/uploads/image/files/xodiluzoraredupezetobagi.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95c0abba26---70161045547.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088a8965e159---8301239446.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • https://led7.ru/file/mumun.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/29439229425.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/42008836009.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6a20268c7---40458193863.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160725bbf02a23---ferigogigadaginiw.pdfIn PDF document text
    • http://gdgom.com/upload/file/210702091446155363g2lkt163ex2u.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/75055836085.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/35284103463.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f04e1d73---popav.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0b62926f2ec5d1aae5ad58f084c39df8/nujagugivivaxagi.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/damaxap.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/rumogudavilosetukusij.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adab4744dd8---fupulejisumizapopudowigup.pdfIn PDF document text
    • http://tidaksusah.com/contents//files/xipejelojaselobifoxam.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/16229834588.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/naporod.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1486b1bb89---30144222652.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/38650832142.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/61740309357.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/1438395793.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/68193322252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lucky+dip+lotteryPDF 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_off0000e76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10336 bytes
SHA-256: 2b2319a0c7bfeb93adaa194a1d933c1df1341458554b530e2c793a727db2f17d
font_02_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 20140 bytes
SHA-256: 82d0cd4fa54dd52c28f28a95587f8061a331ca86904f3fa233b6f9a58272217a

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