Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b51cf54dd55a65…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 04:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87eeb930348c238b252d3372349b32b4 SHA-1: f712721ecb6d62ba06ebc6dcaa2abe1728ddb3a6 SHA-256: 74b51cf54dd55a652c23ab876c5f70fdcd9dbd734f7d57f35ec3fd59d80086aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a common phishing or malware delivery tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=icloud+bypass+by+xgrinda+download PDF link annotation
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391b3e9c95f---paxotaxedafi.pdfIn PDF document text
    • https://andhimazhai.com/images/files/gagupen.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613675251dde5---tojumowuranegaxejotusav.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/renudafuwagiror.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/mesujesewojijag.pdfIn PDF document text
    • http://bubb.cn/up_file/file/19449393298.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/zenowodezowurijex.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/42671136526.pdfIn PDF document text
    • http://c-amc.com/upload/files/kunusiputipekexepi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dixetaledife.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/zogevopirovadopo.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/48187703320.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/kidoboxedawi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614735651f739---niwifizofemirezuwirov.pdfIn PDF document text
    • http://sungder.com/upload/rodawixejebidokamubena.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/78493203383.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/xizunepoxataval.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/sozumikexukidesujarogu.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/17073966637.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/goxazebilejimuwe.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/vexavubixeririg.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135fb9ec685d---jutizuvudugox.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nomaga.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_off0000b5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0C 16328 bytes
SHA-256: 103eb39357ce9684de9184727597c44c1223aa708ba430a1594b851b1767803d
font_02_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 10952 bytes
SHA-256: caaf46bb08c27b5d33c2e7ade61d16e426b64b78247ea6389092a4d0e48d865c