Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af801127e05e7c4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 01:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c5c823c939f14f993eea7ab5e890669 SHA-1: 00874952fb2b1a9a1bbb4e0e0a4d2ef1b875e205 SHA-256: 6af801127e05e7c490a78006365970412464d58eaaa6da3c2ae37ebc3bf9df43
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2b672faa9d3631946fd3170f2ca1cccf/kozimirofoweb.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/64611204187.pdf
    • http://lyzph.com/userfiles/file/Fl202109060301242492.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0ae6851---dogijewadu.pdf
    • http://djapm.com/userfiles/file/37572338880.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/88976935265.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338090840e8---tisewigakik.pdf
    • https://profix.fr/ckfinder/userfiles/files/69835336419.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba113394c---guvetazusinovo.pdf
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/zatujapav.pdf
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/jorakatebul.pdf
    • http://flemingdecal.com/uploads/assets/file/80089401881.pdf
    • http://sevimticaret.net/userfiles/file/36107365734.pdf
    • http://grandviewgroupresort.com/upload/files/87792513243.pdf
    • https://hgindustrial.eu/userfiles/files/70282295943.pdf
    • https://sicurezzaips.it/uploads/file/94890911208.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ae416620e6c86107a392c8eba6d66dc6/bitijilimilifinurovexego.pdf
    • http://viethanit.vn/hinhanh/file/42884256579.pdf
    • http://garagehayashi.com/js/upload/files/61300116498.pdf
    • http://clubmaniacr.com/campannas/file/xewidetebikabikozasew.pdf
    • http://silesiacapital.eu/data/file/3076385758.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/8839693310.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/88bu8gg1dpv72o13aatr7dn5qi/pitex.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/vosalimi.pdf
    • http://poslovniimenik.net/firme_data/files/foradofimikamotamaninejin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kutty+mobile+movie+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db93.bin
3f3f1e7095763bcfe183739480c775fbd6bc81484119cc3e4578801177792dfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 18196 bytes
font_01_sfnt_off00010a72.bin
95213232414ad420ab03eb4aaf8017c233e907b0dcc0cb80e7b72c3fc6273028
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 10636 bytes
font_02_sfnt_off000122d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes