Malicious PDF — malware analysis report

Static analysis result for SHA-256 102de83aa920928a…

MALICIOUS

PDF

187.0 KB Created: 2021-07-01 23:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1db4d028eeecc6f6060cdcd72227703 SHA-1: 84f77e2d465acf8a647d758ebe14291b53490678 SHA-256: 102de83aa920928a2d6a4813bb8427e746be84d8ad3b16a89b34c149ee6c8f10
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. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or malware downloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9640

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://catamma.ru/uplcv?utm_term=d%26o+claims+examples PDF link annotation
    • http://laclonghotel.vn/upload/files/solifuvaza.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4a464591db25bbb07d7d19a2452cf68a/77569577627.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/43883990370.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607677b1b8223---davajikotokasug.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a040650f703---42576289845.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edd460ad3---vakizutezazukevobibufe.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d226a512d74---48971440022.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/37258488279.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/rilezepixuxomikasuv.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b2fbdf820---bebomuruzo.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3584813cfe53446a7dcbe4bb7f3c1984/xafudub.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/tibitotuviji.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j2ll1p8jr217gu8j1515su20t6/16769690441.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wadexajoxilu.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/92463400352.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/46757201676.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609b262730f32---18191784981.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/79c36b2315782c8e53503f629c2d0781/koxemugajosifiwolerir.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/bunilo.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/86128420969.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/7693511399.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/47d5dae7ba8eb4c503bd8643a1e84f0b/33785490785.pdfIn PDF document text
    • https://paperland.bg/uploads/file/80089415622.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210701_5B4F787C92D9546C.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 154432 bytes
SHA-256: 8fa5fa0393a8879cb522dbb46e5c0587a8a8621df1f2b9c0b9b5196a656403ad
font_01_sfnt_off00027e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002965d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2965D 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_03_sfnt_off0002a8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A8FE 19776 bytes
SHA-256: ae483d4a57c17999396cead2c0624636e146f40bb40b4e0ab0a1e4396d9f5e13

Open this report in the interactive analyzer, or submit your own file for analysis.