Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e2688f158a31ee…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 09:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a2a37fdd3748aeb17a1ad9ec8f18f0f SHA-1: 5eefb3df39d9b5c5d3f8c87ab66072563d45eb16 SHA-256: b1e2688f158a31eeae20b8b59541bde0e709cc2705a1083154cfb801ee875417
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://geologicatoscana.eu/userfiles/files/54710634166.pdf In PDF document text
    • https://alixdemassy.fr/userfiles/file/42360915088.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/bikamujatazadosek.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/gevujizaviru.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/81721190750.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/40799241008.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/62045367802.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdad313297---lotet.pdfIn PDF document text
    • https://tcremich.lu/files/files/zejesetobo.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/jabivunesadulo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614167d056e10---31423478110.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136037573474---54770833472.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/kibebekoripuwumasivow.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/bixixowofibijitebedasew.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/76066377621.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/650008319.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/kefumeviribolajarinetub.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161412e8099df2---xidoji.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f13323dd30104728589d9dc20ad85a83/kifudo.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210912025932.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9fb53ee2---37283969326.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/87585765855.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/fozeberizozex.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/89977600097.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/mipugokutevudipitinug.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/liwema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=melvor+idle+androidPDF 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_off0000d9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A7 17692 bytes
SHA-256: 1c864206cc6d01b8130ba9317bd03e1ee175dedac089b3b8678d98b1b625550e
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10036 bytes
SHA-256: 954bf8feeda17b5886cc77295ec34adbb6d0b0d0e58230f9b884b59fe8eaa2bc
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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