Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9d622a908495da…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 02:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49b65ef4ea6651310ef01503fd959225 SHA-1: 2f82e415020e1e5da2941c2936c04c1953c0e877 SHA-256: 6b9d622a908495da70676d74cc8ac250ef8bc7cbebd887f21ec68ee08245f9e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to manipulate search results or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. No scripts were extracted, but the structure and URL patterns suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://net-mex.hu/ckfinder/userfiles/files/8584038885.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb3ab0743---dunedug.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/16041251041.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210831_6F8A3B9186C54BA6.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/bozilobosewov.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/17448227344.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070fd76cffc4---nemiralifawisada.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3ff305128ab492ed3bd95af5afd962d4/81726580682.pdfIn PDF document text
    • https://redac.ch/upload/mepem.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/da58ca64e5b941096683b994e873bdf7/jeluwenapupuzuduwad.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/fibokusovesil.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kkv251feq8mc840j8h14b7kls5/83564850521.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/48869791293.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a873073b20991d40caf1262663e0dc9d/18742474608.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/26307238399.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/48886260548.pdfIn PDF document text
    • http://dhf-china.com/d/files/fukizokadaxukidonexeme.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nhe2bpqs0kvkn33etnvao29ff0/lawubatufoberejeromepo.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/wumenobogotar.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/43941633304.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210705_B988D2F3ADE84A70.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/zabikufebisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=skanda+sashti+kavacham+pdf+englishPDF 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_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 11080 bytes
SHA-256: dd9706307253bae768e80bcd9018cc251297312407c95846dad7a989915e50ee
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 17384 bytes
SHA-256: 74babff95596d12887fab8ec3e0b8c373543421f37455559d73bd3a416138f1e

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