Malicious PDF — malware analysis report

Static analysis result for SHA-256 172d6c7f89178177…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 00:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e2548386fe00c2a3b50d1e199f19fc0b SHA-1: bd3613f02fd5bda10759db46851ef47fd47de606 SHA-256: 172d6c7f89178177131aa22d12c69089bb422bd15ce2df8acfcf54f5bb57f408
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs that form a link farm, with many pointing to compromised WordPress sites and disposable domains. The ML classifier strongly indicated maliciousness. The presence of these links suggests the document is designed to redirect users to potentially malicious websites or to download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=www+football+betting+tips PDF link annotation
    • http://accessprecision.com/userfiles/file/85206088383.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ae047869---zenedugumasane.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/42233207108.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de303fa64---bekunawezezomofox.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mugafazuvaberivorukaxepu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4bc4792f4---24980741215.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b65209da88898130f9d6cff12840add0/2573730054.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kotulutaxulagepidizipit.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5289a708e3---zutudo.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b574a85db72---ridovojoxovetotukadanem.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/52962176070.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46e48a4ed---80250711546.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/gekovedubimefoxewodozumi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7bfb1dc2d---fofojemobovepewunizojiz.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6e5799b6---xaruxexapunusef.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b812966bc11---doxoxixemon.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/32568096479.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0987bbb1b---werojonagisow.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501021302107.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/mojota.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/g1quuu497hr7npmomn9k2kv1v4/zovebinakume.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/3h932ubabco0q4tuaok833cmb1/remanu.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///zuxenemufew.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/wotop.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/dajasevazus.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_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 10652 bytes
SHA-256: 33c4e8daabd9a6cef75da9f508b8795ef69996b86806194fc734af95313ff54a
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 18100 bytes
SHA-256: f9a2f35e385d0cb0b4ba0d4f433b1434bfc74e7ab03ef24f20f9fd8a248bda48
font_02_sfnt_off00014156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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