Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79b0305ab3ed555…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 20:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84a056c9e7b46035c285476a4e50a884 SHA-1: 0a8b637baaded998220a3ee207c58164fb279eb1 SHA-256: f79b0305ab3ed555fb1f9bf60490d794a85bd77b4f376b85bfa845e91fa0bb0b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sitarofindiamd.com/userfiles/file/detawosi.pdf In PDF document text
    • http://poetische-malerei.de/web/editor/files/woxosuxujeziga.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/27218694673.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/12474557741.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612effa403315---dadotaxaviropesalixomun.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345518eac48---88223742995.pdfIn PDF document text
    • http://hmed.vn/upload/files/53135427663.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/jebizikegitumixafowejaru.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/zetufikamumefamirej.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/duzolime.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/22280474905.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/85999998620.pdfIn PDF document text
    • https://alkoplast.rs/files/doxasanomazimafesisiva.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/75139632098.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///46721248172.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/wewesexiwajativilurap.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/88826600931.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/26457118998.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/nakamoril.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/31054428554.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/xizuvafexaxowun.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/konebiwetamosu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139921bc15ec---95864068463.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/rusimusoposo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fhknrbq6recst5ufvau7vubp3k/22427060202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=shadi+me+jarur+aana+movie+online+watchPDF 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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 10924 bytes
SHA-256: c42a2c373bbdf68c80cf4c37441b5d10efb22eb6879479dd5dacc2500e51d0a8
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 17424 bytes
SHA-256: 9ef423e6566aa6f4d417aba0e649acac944b25e2ca982551f47a638d388a7034
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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