Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7aa574227a60af2…

MALICIOUS

PDF

103.4 KB Created: 2021-06-26 15:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 61e8e378ef4fa64bf08bedfdf5544909 SHA-1: 14b4b48069327355a4854b21566c2720143a47a3 SHA-256: a7aa574227a60af20c6a215252ce80bbd42c6732fdbeb7ceb82e7e5514329ea7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, luring the user with promises of a prize or lottery winnings contingent on parcel delivery fees. While no scripts were explicitly extracted, the presence of numerous URLs pointing to compromised CMS uploads and link farms suggests a distribution mechanism designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r6bs1g9fc0bdvmvt84u74ugi9c/46132955621.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e45f39e094639f2918e1b9f175ce23de/kopedamazetenuxo.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f8336049aa1b0bb4fb51860cd68893c4/9172407321.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d6396d73f---fotusasajigerojikid.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918b040971---vufik.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/69ffb9cd58f009f64396dbc4d44acf8e/ditun.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607553a028ebe---57740357355.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/87f4ea0c38385d37e061748f437f733f/11227571859.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d9315cc0cfa12cd343f2eb5a65c9eea6/zopidobaxaxirukedixu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/bk3hentfbquqdofll0hnn00a4t/mosixuripefuzama.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098138be72fc---kakigekapusuwijapawitore.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/65407273428.pdfIn PDF document text
    • https://hyundaia.ru/userfiles/file/9363779890.pdfIn PDF document text
    • https://ever-progress.com/upload/files/mozewem.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/nagos.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f2dd8e51---78691453321.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1256f1332---somoweki.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/e63cf11adb2807e192b06f430755c7dc/34887613941.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afba8e8582c---99509261828.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60cbc266371e4.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaee780c7---89174113510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=song+of+the+year+2020+grammyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 16688 bytes
SHA-256: 07facc47fe04be47e32019883fd42b5890cb0f372e1c2c2e02cdce62b3495c72
font_01_sfnt_off00013119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13119 17636 bytes
SHA-256: 35855664faa8ab5b9301086ce8b8c744a5c640effff937b7e9791008ed0dd968
font_02_sfnt_off00015f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17747 10788 bytes
SHA-256: 67a27ca61bc09a31718273691c0f0c178a2e98472f7bf396842a7722ccb30010

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