Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2507c7e7f3f30a…

MALICIOUS

PDF

88.9 KB Created: 2021-08-06 08:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7ce038fa3f16bf401c6bfd219c45b53 SHA-1: 2bbf86b6a3c8b130034e4199bf053d7e09be0b7d SHA-256: fa2507c7e7f3f30a6a89ebf8701ed411c8f1937918eba68e7de30136e2ec0bc5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple websites, some of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the file, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7gmsuf1m5qj16kq8ql9mqiiibn/81480132542.pdf In PDF document text
    • http://jyotiacademicpress.org/uploads/file/17312778015.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/70612061624.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/rebogatuxekewuxetisebobi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/77269250309.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/29792261837.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/ragabop.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/bevavozafupusobo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/32321905846.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9bc7d509d---87660177345.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/53966750775.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/jafegefaredetok.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/18hm313u4ccg55uabch3s9e9bv/kokibefulokijipenufe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/59491970208.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/12912a7e7a5980ffb3a685334c1cf73f/85868114383.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e2a23c67---purelawolupesajalibuvur.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/9760065544.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/batuvibeniwukupovajivap.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1bebe1ec---98285817798.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf46a4d6f7f---97442137171.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/58ea921b830d13ec2e9bc6fc0648efb2/96858282148.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/gobasakulijoronisekotozik.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c312a4c72---kegadofematunuzijokisopa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tt7v93ts8q329flah0kibv64o0/depimaxofezozefam.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/81275433520.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/12229678391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=abbyy+finereader+15+full+megaPDF 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_off0000f612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF612 17552 bytes
SHA-256: 116ab02e0d9c9ac6d485f5cbe4fdc90f81afbaa8b2b7cf3bdf0a1703b5cacbe1
font_01_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 10832 bytes
SHA-256: 98bb7ac2d156382fab272eafd5b59db5c236023c993bb7936b368cc234c9d4ea
font_02_sfnt_off00013ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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