Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b6b2f06f4baa5d…

MALICIOUS

PDF

82.0 KB Created: 2021-08-21 10:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65ad1bec9d8ce7dee1eac679a6db2bca SHA-1: 99f694ef8cf28f6393099f6b85122a5d18d5e32f SHA-256: e8b6b2f06f4baa5d2a1a8e3a4a51796d60e020e7a4d11587786137d7e3d8c427
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure and the nature of the URLs suggest it's designed to exploit users through a link farm, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b810f197d74---22061505399.pdf In PDF document text
    • http://erpos.sk/data/files/bevuvurokiluzopodosa.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/getomer.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/venizibubeburezaviwi.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/70368408757.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/korusokujenabapovowisiki.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4av217ddujan8aunn388m5i76/kaxuxipelojobonataxuf.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/58719546927.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/3932206095.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h3nqsplh0na5j1sbvuvbc7eju0/duzifemita.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/86673427779.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48a57f836---rakuxizer.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9534664dc3---gexatomadex.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c351975ff---18587772184.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/sujuvuxerada.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097831e80593---dadojuv.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082569479dab---rotulozozelidapixilewoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cuaderno+de+trabajo+de+matem%C3%A1ticas+5+resuelto+todoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 11248 bytes
SHA-256: fcfafd28e5308fb7ba240e67e6d51809b7a154ab465ea9e735b7f492dbcc9a2f
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 17236 bytes
SHA-256: 7b6a8376d4b4551e886461995ad2bc829be12b4a3bd3b7877d3ba0a45d4a742a
font_03_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9

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