Malicious PDF — malware analysis report

Static analysis result for SHA-256 356e5da56c695ed3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 00:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1827e67cbf18cdf9932cfd95b7f1f0fe SHA-1: 8c3f517b641c5348dcd5f3cc0543d5281c2d2845 SHA-256: 356e5da56c695ed3ddee42598abcb4d7183dbfccecce8eea28e21587c20c23c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://mp-hd.de/data/aktualnosci_imgs/file/72355921249.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2df87a5ba04febfc5be4242a934d3cbc/buwewobuziluxedazox.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/jujunu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xodotosuxutubugogonajitor.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/jeruw.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/xugirejidamilux.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/lipitipipisagebep.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/54038054553.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/xiwaxutubekavalijadijinaz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fb970816dde---saxekiwoterovasaxi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m9ju3jae6tirjne9bnfad0mpc9/49736930181.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/51033495164.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c87d8036269---33526493417.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d00h2daj6uj6batsarqjr01m2d/7923115607.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65fcd5801---tuwutabofa.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b92d80cd3a042803d6af7f023472f017/41677120357.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/januvajejeb.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/65b7ac2d138ee4cdb65dc6968c012f80/43743998806.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/serilu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077471be8bd7---8320328671.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/finapufosekafabaposaju.pdfIn PDF document text
    • http://klinok-saintp.ru/files/52177347353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=syllogism+practice+set+for+sbi+clerk+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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 18664 bytes
SHA-256: 6d8ddbf2811bdd6661a71db96c07c002a1812120ae2f66a848f4602f1ca1971d
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 11280 bytes
SHA-256: c5a6a48f50ca58b354c0ea27f95965025be11ded29f7130f85572d97fca7b0df
font_02_sfnt_off00012add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1