Malicious PDF — malware analysis report

Static analysis result for SHA-256 117c1d1f004b8c55…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 14:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b9050bc1311e68d52e34ef3963b56d7a SHA-1: 786b9d44d2ba5349fa0410d1f8ad32d9690236fc SHA-256: 117c1d1f004b8c55191214237abc3cccd794ab4fadeb905738980e31bb77354e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including a link farm hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://osayit.com/images/file/wofurefef.pdf In PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sudepezonobisadewo.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gavuruzuladodozutob.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e91138d5a37d5d84bda9d1f3cf0830d7/8977373632.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/36224540482.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/l5s6pmbt1l8aaffne9qo131cdl/49002595312.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/9233231348.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/36981072477.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/57424890376.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/g4dbpcfk0skpiusi3269vgsde2/vebozudexopokum.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/62886271685.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/napogabunilamevozajofuzaz.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/luwuwotapizupijadekefago.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/45494844458a02bb606fac62d4ed022c/88219522119.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18276d2b6---jogiwaxefewafenaxupeguk.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/75712739662.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/44642234967.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/e74g78lhsatdjl3kstois0ht46/xuxazorejog.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/52023454738.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210911144656.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109062050539350.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/31064464232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+sites+to+stream+football+matches+freePDF 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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 17720 bytes
SHA-256: 55d2b075df2573f2e881073e2a053aa0a92e048c19ebbabecf076fd926845ebb
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 10692 bytes
SHA-256: f79eb515ee234924541b33def1e74643ebfecb2c17983dcf7b2ceb7521770e6d