Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed63953be6e71130…

MALICIOUS

PDF

76.1 KB Created: 2021-10-04 14:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d131b81126f37c42e6cdfed7af239470 SHA-1: c4ebc7e6450b3ef6d0ae160d8e64a99a23787257 SHA-256: ed63953be6e71130f6bb2a1780f065400111e2ca3a35da98287a94a9f7217d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, including links to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://queure.ru/uplcv?utm_term=business+and+administration+level+2+unit+6+assessment+answers PDF link annotation
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/73704538772.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422e5aa74cd---49149910453.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356d173207c---lunuriwoz.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/nasavitevarexixunakidope.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c304e80146---lazovas.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/fipidowixanelifejegabebus.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/5400223222.pdfIn PDF document text
    • http://zgic.ru/!upload/files/dimagafoji.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/25076737850.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/dabom.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/96474992464.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/pulenoganuvagefijinoz.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/58202184786.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/walokej.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/27317151250.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/logadoduguk.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/vepotutadugora.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/29153911970.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jimozafadorufukipa.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/98633916277.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/dukokif.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/37932442998.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/fobewuwedidexagaxipi.pdfIn PDF document text
    • 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_off0000c5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A4 17108 bytes
SHA-256: 405756d7fc602af88ff56713a006c40f1593618600125b98205121ed8b48070c
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 11000 bytes
SHA-256: fa560c626ba6985ab84a4b2725c9d1809ce16c1ac24a077f7bf07652a54453a4
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1