Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac4f01a991feee0…

MALICIOUS

PDF

80.7 KB Created: 2021-08-20 04:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a79c84d733aaa454e459478937ab23ad SHA-1: 2db2a41b7df54d66115a6db9c5c70e7e973bbe28 SHA-256: fac4f01a991feee07f3ba585e721e2494cf17ca65d840fb29d4fe43bf1a55bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains multiple links to compromised websites, suggesting it is used to redirect users to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically indicates that the PDF links to WordPress upload storage, which is a common technique for hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3baea04a87f438f5382d699d36c2a4db/xexux.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c69dceaa57f---xoxofemaralodepawezi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4da7a4e5c---25826830219.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/xutotimegi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/n5tsedrpq1khdmcqq5qvbu0eq7/gifozosasu.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/95218759493.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/liniwiwijesoxutifi.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/sununipegofazarom.pdfIn PDF document text
    • http://dentherapia.hu/files/file/leton.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed0dadee39---50951076209.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ps0hhd65k6l3jov0hrc0hnjhcq/nifojojasak.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/siret.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5cd2703f---mimadizuvifojuloliruzakuk.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/97aca3c15645890bbafb732f8cffe2ef/sugopumu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/20089584367.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf5707a25---15705920582.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4bc430414---wavamabowutijozagetox.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0416a6fb28---8369565342.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/20522503816.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16081c90fd4c5b---sitix.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/74137363284.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0c87863d---73275220213.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/wewol.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/motulasufivesavipep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+book+of+five+rings+japanesePDF 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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 17124 bytes
SHA-256: 2a0f18093068bf32ad5f7806fc29ebbd6b4d07b0e11fd44c574e4d02ccd1e104
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 10884 bytes
SHA-256: 7396c2dfada855f73db99de1b4865533f7cf37fcc8d1fc232ac4a49e5a636846
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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