Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fafae1b86ae8faa…

MALICIOUS

PDF

99.3 KB Created: 2021-08-03 01:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e82a228b11bb4fee21f88040f8ab7411 SHA-1: 56d50f7f937741972dc8571d745e4d439ab60c72 SHA-256: 8fafae1b86ae8faa662ed7145fbc3eaffd94e224d4e9d6deefaa83bff7d01217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://prestizhstroycompany.ru/SITE/files/editor/file/fuzanererixosezekel.pdf In PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaf701c9f8---fosow.pdfIn PDF document text
    • https://btegypt.com/file/vinijuwaf.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/62259056085.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/44340405819.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078955453498---56095380954.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/11046028439.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce73b7tmchd2ajg88jce5s8li1/rewegirugefowuxitegubusuj.pdfIn PDF document text
    • http://dzbnf.com/upload/file///gidusige.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/i3v50kj8oi262nr516j0e6jcrg/bomisexuxe.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c34e6e06---73190458991.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/vezikuluxofi.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0980fcfa43---50512145538.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/tutipalabozelagixuf.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/oslemnc3iouh4r73c3cgpsljg0/26503310139.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798fc80bc10---lagowadaxififelopazax.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073998aa1126---46592372336.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/fc3a5da7499d66da0ab40282c436063f/wojaniwimewotizob.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/sawir.pdfIn PDF document text
    • https://t2sc.me/userfiles/43486183255.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f6f8b9b9bb5da09356879bc06344a7b9/vowiradaloxedazigel.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607225f2251b8---dofubiwuguferederavowerog.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/tavabevugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+to+say+for+a+1+year+work+anniversaryPDF 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_off00012088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12088 10668 bytes
SHA-256: b3d5789ddd22263494d63473ce591a63293ee425cd44f8d0ece674167d9ed952
font_01_sfnt_off00013922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13922 17024 bytes
SHA-256: f954c55fe960007ece637b8b4bc1d5c9f35344b978a47e851ba4a3514778656c
font_02_sfnt_off0001656a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1656A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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