Malicious PDF — malware analysis report

Static analysis result for SHA-256 add78f7d59aa822d…

MALICIOUS

PDF

85.3 KB Created: 2021-06-30 08:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c94752415c4737b8e82bf76b9312313 SHA-1: 29698169832c39eeb605409dfd4ee0800c595f4c SHA-256: add78f7d59aa822d34c028cb202a5cd4ba38e4588add0e5d2bb482da825cfc43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=iron+deficiency+anemia+meaning PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f697b78651---93113842398.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075e97263cc5---89458443328.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/8304308148592b0af13109549d3413dd/73772927289.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1dc446a53---fafamapuwofi.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/61493443244.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a502c67565a---jagolimokovezijegizumod.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3eb9d2b6---38631940376.pdfIn PDF document text
    • http://elm3rad.com/file/tijuvikimap.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9ec4b1f4c338b38c8d07498ed8d204b7/20358976163.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5a3148a0a50dbf20222c79c80df3258c/mifutemuxanixafadepen.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/57578248798.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/c873098b0a246250c51535037671059b/38337602185.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/68016391536.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09f837c40---nawalufu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0513f2df9f---koxufibo.pdfIn PDF document text
    • http://yejida.com/userfiles/file/gosutedawigalugafubo.pdfIn PDF document text
    • http://slsnn.ru/content/file/gujut.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/134ev895tv43koev648bb5gs5n/buwukixafedova.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9021b07f5f---81214974038.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6c69a563bf7f62f5f496152f5aa82343/84211023642.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608842bb78786---sejoli.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/31538277055.pdfIn PDF document text
    • 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16436 bytes
SHA-256: 7db45d2ebfb5e947267cca444e43afdca1fd4ca913d4cf29a8712532ef291464
font_01_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 10572 bytes
SHA-256: 50164c9c326837ee8b942a2972bca01860ffd578b2d33600e18eb29d939dfabf
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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