Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdcf94fc239687c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 15:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36bac0115db6aca3794cb66b73b5cba3 SHA-1: 2779cb356dc750c0d38fd4a6d1c0e40ae7d08247 SHA-256: ecdcf94fc239687c1287969c74dc9fd287b9bedfb8a02508b7de36d9e5d1bab9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous external URLs hosted on various domains, many of which appear to be compromised WordPress sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an attempt to distribute malicious content or phish credentials through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f555b6adb316052ea91ae43c9d587ea8/wutufa.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c7d0bcbc940edf77654838eaa392d8e8/fezabanakij.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/dipojutedowedomejabilax.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/mapili.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757629c6e41---21923878899.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/57a3d2221db807297f557895a16f04ee/sipigefogurixota.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/25915975825.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jutefapunawoduboxi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607848371bbaf---83326667684.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/25f8252aacad6a6d1b1e75feecdc408f/84184958417.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/22339349594.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf40539bfe6---88774037637.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/85006609384.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a2abf5079db---48388016270.pdfIn PDF document text
    • http://hasyo.net/files/file/visefidivanulufex.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/87890975176.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/t8947n1dcj292snrn1315qmqr7/doxurenuka.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/wedubukexisasevaju.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/nipaxiv.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/58487542485.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16089d135786a5---fonovonimosasi.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/jabuxumezuxerorer.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tusaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mengganti+dari+word+ke+pdfPDF 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_off0000e0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 18204 bytes
SHA-256: a96a075c80b28e3498abe8f901b11c90ff2ecf0eac5a555068482d04ebcfed22
font_02_sfnt_off00012859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12859 10632 bytes
SHA-256: 41d7323262ac51b45f89e872b3eacd167d3629430188fbb9f363ce4367119d52

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