Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8226074758a091f…

MALICIOUS

PDF

74.5 KB Created: 2021-07-09 20:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 737538908ea507187fc23d98915b9811 SHA-1: 56d1b8db0fc2a4ab865b8bf9489b26d997a18967 SHA-256: c8226074758a091f4a32cd75970b46ee39d46b8d236e7c88a37e5c7ff5d351ff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's intended to deceive users into fraudulent transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b224856b8c2---91231547645.pdf
    • http://jinistudy.com/_UploadFile/Images/file/84940856181.pdf
    • http://poorclarescork.ie/images/baladowaxada.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827be6a5003---27814654089.pdf
    • https://workinhotel.com/upload/fckfile/38349359433.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897ba6be7e8---94828400466.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/0d79ca32d14e13ae8ba6e5f306adbb74/wabowu.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f15c062c9---3062698946.pdf
    • https://hondamienbac.vn/userfiles/file/24511456347.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084260e9dd67---5569203123.pdf
    • https://mvpartners.be/images/uploadedimages/file/dajupegame.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3219f101c---jodusawuk.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/66nilppp4qdllokbebpuh0qo6m/31440490519.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2144443e07---31548908631.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1cd2ff3f602da2b30ecf6ac861cd72d9/3284472350.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4d22f685---48048205054.pdf
    • http://asea-admin.com/_userfiles/file/20210503033424.pdf
    • http://mariamozharova.ru/uploads/files/fuselogexuzapisi.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160801273eae52---tanujotejowipu.pdf
    • https://larioenergy.net/uploads/file/kurinupadobiwirutenevuxo.pdf
    • http://arunimaflavours.com/userfiles/file/5911048110.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bc3d7f004a3dd7ffa97dda267482ba42/6370583959.pdf
    • http://shuswapladystriders.ca/userfiles/file/51101866154.pdf
    • http://rainbowcaterers.in/userfiles/file/pukuzeju.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f935dae7a0---67836080337.pdf
    • https://arhometutor.com/userfiles/file/tesipezuduwas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tension+meaning+in+tamil
    • 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_off0000c5b2.bin
c8c0de423ff6c425e5373a0749e8d99aa0dd86357ef6ea8fb759a94f8a4bb8be
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B2 15680 bytes
font_01_sfnt_off0000ed70.bin
307b0750ce741f5801cbb860ae600565f79d42dad7c5613d6c38c6efcfad0b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 10312 bytes
font_02_sfnt_off000104b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 16792 bytes