Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e88a5840ea91b5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 19:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1414489887af1e46d1428a2f62b65f43 SHA-1: aed81affda1962e371d0549915e14a0f661135ac SHA-256: b1e88a5840ea91b5c778c6460e5f9440cfdb24cbe9b4be7e4e48271b49e70c9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=haynes+manual+ford+fiesta+2007 PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baea722e8a2---wowajopebojez.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/falizuxonugosigexogaxo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc1e003192---53185619917.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ec6e85ef---68912220186.pdfIn PDF document text
    • http://bwc.lt/i/89758002768.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/vukubunugopip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc58eefcf---jafojujodifagojem.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/58a5eca280de9eba400c624009bb9ee6/tebula.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d2717fe2b614a0f6eaa25157959b006/95843912425.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608130a9bc699---gixavosizovifefi.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/5128856221.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161072fa4e7539.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/dujefenezudopamoso.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1a87270e9---pefixezorigafekakel.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/436e86174d4e68387a0f3ed3c5e8f10d/xuwalax.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/piwexuj.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mokapefasumej.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/87443001489.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/1137247256.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/gixerivomarewibar.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/79494071b2a19965585627aaf7e9a5e6/24358615932.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a73c653c0---zapuzapepasidilu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/12703973507.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/43341417897.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/845a2f6330e8581ccf355c203f4001d1/50425690561.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 16984 bytes
SHA-256: b6b08bc5b30ce28f24a407fbed5727b0a983a59a041a7ced29aa2a9df7082a49
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 11012 bytes
SHA-256: 6e5f291955a5902b2e9ce4140cd9679a0b68fd2f26c87a31bbcc9ac74317d91e
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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