Malicious PDF — malware analysis report

Static analysis result for SHA-256 273ceae5aac8be3d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 06:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9c8194ce5782932e31463dd37689044 SHA-1: 1e3e2508612baf73b34a3179b8fa23afbbdf7a9a SHA-256: 273ceae5aac8be3d8d16547d6318054b1f17590e0983510c88fe711b7b4cf1ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute content, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=scanner+software+for+samsung+scx+3401 PDF link annotation
    • https://aymsoft.us/aym_image/files/livoz.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_17_45_34_9710.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/mexitekuxu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/78864297442.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/46594796472.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/57034727375.pdfIn PDF document text
    • https://spyboarcams.com/files/novefigifikit.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/mizulafepukigunexesuv.pdfIn PDF document text
    • http://gazetavk.ru/img/file/safifepizesiri.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/sozisakubumasugamituxe.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/33366610108.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210907173438.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/gekifokevaxeretawigulid.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d999fc5aea8574dc5614566e2f249477/2482323809.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/toraxepa.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/odivaragogukekamewoliz.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5dc44f3b80749d933300f39c877b3650/kajoboxivigizuzuxuwitela.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/benosuvo.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/lukenogajaruzewika.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/tobufojazi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/709711e0779bac4ebf143a5e04e7a6fc/xowigoxisike.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/batome.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/46141451909.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_off0000d823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 11328 bytes
SHA-256: 1696b1bab4bce3cdbea9c2f282297a2ee4221a8006d10a85fa2159e1b18702c8
font_02_sfnt_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 19524 bytes
SHA-256: aec5d5a58205c99d848ad94bd41806f4cc029664fc44a8a1ff4c4765f67ed4b7