Malicious PDF — malware analysis report

Static analysis result for SHA-256 da17839e4fa4c220…

MALICIOUS

PDF

145.8 KB Created: 2021-08-25 03:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7698ed39af8177a82bec268a8eb0671b SHA-1: a79c2aa802684e49112f72d7b4c79798a5508b4d SHA-256: da17839e4fa4c220677af67eb2432e89ca623e3dac71a4904de62bdf0b719cda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The sample is a PDF document that contains a large number of links, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of a link farm on compromised infrastructure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bdb49d07---linogamibawevowopuki.pdf In PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607076d49f962---zapadamibaluxubiveduxuku.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160910ee49744d---loluvanalawazexoxav.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/9800282359.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6db86ad3ef65ad44e665061a81314527/jivewabanejukifuvozubemoz.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vazixun.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7gtqggmsneknau33sr1gkor1ru/wixirupitelezomowuretax.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/192ee9b9fac531a6a86c96e18d47ec92/rawirobosajudaxiba.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/78628569368.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/9ja8ob8v1u166nr04jhrkloglo/busaxuk.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075189b4132e---33921627373.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/72609570411.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/4635404365.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/94583335895.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/fiwoniwumafedamagidofaje.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/19770385780.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f49db393b---9272159309.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/8en5lfrqmkb0tr3472h7rg210d/wifonagoxosexuzoraxex.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/69581706692.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b33cdf75775e85640f56ab51adc837c3/koxafem.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/46169013916.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/mixegivetazeremiwudip.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/50384452914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=total+number+of+muscles+in+upper+limbPDF 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_off0001d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC5C 10844 bytes
SHA-256: 090a88f26ce83a0814054256e38032a21a3f5482cd40fcb959d49db95c69187b
font_02_sfnt_off00020529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20529 19272 bytes
SHA-256: 4e75e585eeb6ef294e3112d5417d4a3fab553f5f6c03d0c8a387629554555a46

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