Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2856b4ff2f1f88…

MALICIOUS

PDF

87.1 KB Created: 2021-09-17 16:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b734e1d01af202a13534a9004cd7ff71 SHA-1: 7fa212470301d133de99dfe9dbe67e9b6a8d463f SHA-256: be2856b4ff2f1f889d8e1bde70bd8f1b4542d8231c3d79c0fa2615ca223ed653
164 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 WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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.
  • 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://portableandcool.com/files/files/38878063843.pdf
    • https://tttinox.com/upload/userfiles/files/87306976208.pdf
    • https://qkon.ca/images/file/90132351521.pdf
    • http://kiuanai.com/userfiles/file/73166823616.pdf
    • https://karolinanowak.com/userfiles/file/vifijanobesovetiwuxudi.pdf
    • https://tp-pos.com/uploads/image/files/68484150243.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/wafamupoxup.pdf
    • http://test-immo.com/file/vomadad.pdf
    • http://ohdiabo.net/images/ckeditor/files/2190385962.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/belivawujowimizoduwu.pdf
    • https://danfort.lv/userfiles/file/14235524293.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/33708038108.pdf
    • http://iviltra.lt/images/files/pamuxujisipifovepumigew.pdf
    • http://urgentcarepb.net/userfiles/file/84410728609.pdf
    • http://80tner.friend-match.com/upload/files/subobi.pdf
    • https://cytokin.ca/upload/editor/file/lifevebowopefipot.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130653f4d3a0---rajimosigulapafivusiv.pdf
    • http://dungcucaytrong.com/images/files/28571537819.pdf
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/10275794747.pdf
    • http://studio-orlandini.com/userfiles/files/ropixalegajugarorivizoru.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/456f4d1cecab295e1aff375817b92ae4/nelosenot.pdf
    • http://kedehg.com/ckfinder/userfiles/files/moweg.pdf
    • http://jhdjt.com/images/upload/File/rexiju.pdf
    • http://www.bc-arman.kz/ckfinder/userfiles/files/44828516824.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafcee4c1e---40516263377.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=words+in+a+sentence+starting+with+the+same+letter
    • 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_off0000e8d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 16792 bytes
font_01_sfnt_off000100e3.bin
85003bd3114fccd857c0f1f72ba789ee15e327483b1538f79a225a18ec229430
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 19284 bytes
font_02_sfnt_off00013355.bin
8deff8fc0cf4015c771e656e882c4e51870bce8552c89a9ace777bf0ffb637d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 10896 bytes