Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51be0835f8720b9…

MALICIOUS

PDF

99.3 KB Created: 2021-07-08 12:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a8d7cd5a0abf42dc03c564114b55e731 SHA-1: 8b19e9b10cab9765e2387012aacc79c7179e4103 SHA-256: e51be0835f8720b927783fc5e64084cc47fddcf2f6c850280d137f8af47a0e35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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.
  • 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 https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aadbe6213---58676236556.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e93d4b92f---39215059838.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/87854672029.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/94173916740.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bf766ad38---50748240653.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/30675835752.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jejedavovisamumenobibes.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dee003293---9378533822.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cce129e03f1---76274999327.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bde5ecb55---nigibive.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/zenigekenegilovipopav.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/siwimogemiwuxowube.pdfIn PDF document text
    • http://laduses.nl/image/file/22164881864.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/jo0g4l0smkne4d5cg6unpimk8s/90335876580.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/bafujupalofavowajam.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/lolal.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3l65ol5eqgiof5n2s65cnu6rk7/walemukapa.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/86824001671.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c990f3250---12084189623.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/37749e238d7d7863730cc2c09b1f4e87/sipigibegabitatebifofe.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/degiv.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c17556150---jolaxilujoravupel.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3bb548661818dc7d0ce535c06d466487/xojatokegan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=intuition+is+realPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 16452 bytes
SHA-256: 935e080d2693d83bb4e3c510827c91c159065c387133752280b470824dfd2fa2
font_01_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAD 10152 bytes
SHA-256: 6d040fa0f4fb1ccf9febc17b00085d87953380993c228f6c5eea1669e5b668d6
font_03_sfnt_off00015183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15183 17984 bytes
SHA-256: 3bb43b285c272cb3a1cfca7880d0b80d41d13fc699b5a2cba981b65b958ea173

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