Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecc6c82c2f5d065…

MALICIOUS

PDF

67.4 KB Created: 2021-09-16 00:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61e28bc2f2362f1197fe4ea498b85b1d SHA-1: 052ca1fd91759ed9a605ee287b8eaa6f8f6ab75b SHA-256: cecc6c82c2f5d06504a0b370a2ebf0ed4f7959d69f257795059a3223ae70bb46
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=strymtv+apk+download+for+android PDF link annotation
    • https://alley.52886.tw/uploads/files/zikox.pdfIn PDF document text
    • https://777mto.org/contents/files/83344746215.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/7ca5b206bb26c391382f33f0e82d1ba6/1492104718.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/75806826602.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/54679951917.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135065ec64a8---rififafiboridaluremubavu.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/42472504556.pdfIn PDF document text
    • https://aaaxxion.info/images/file/xokukaxalulanu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/38291331004.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/zimixuwerewakofibelagu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/27600732758.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/32528063080.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///wufagapeloxipujuz.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/xexetan.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/guferegitasifum.pdfIn PDF document text
    • http://generoussecurity.com/uploads/46883389230.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/52292097457.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137998d556a2---73560140599.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53319042526.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/52974351504.pdfIn PDF document text
    • https://wonkingchina.com/d/files/fetuvarawigovusuzelavug.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_off0000abbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBD 10792 bytes
SHA-256: e516bfaa895f3acd7a349ed54bec726c0e7efbe00c0a466329445522878442a4
font_01_sfnt_off0000c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 14376 bytes
SHA-256: effe6433991a9342b54f6cf530eaed0da989c525cc6babf15f82b4167d73f234