Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b94dc3c7f600c69…

MALICIOUS

PDF

87.4 KB Created: 2021-09-10 14:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c73f239a42bd243bcf210e810c3d165 SHA-1: d8f652a2fb79f7eaab84e7c4a7d76c805a8ef813 SHA-256: 4b94dc3c7f600c69b918f3d019483604a854fb6657d1d616cb59d39e06f61c37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The numerous extracted URLs, many hosted on compromised or disposable domains, strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=year+5+targeted+comprehension+answers+pdf PDF link annotation
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/27511592390.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/35386604856.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/7078940666.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/30135496817.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/heivtuar19hb7vqdlimv79sevi/86474307743.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/88899579416.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/kitolututemunukab.pdfIn PDF document text
    • http://tcihk.com/userfiles/8029571528.pdfIn PDF document text
    • http://isvpro.com/custom/files/jevezumazovesavixew.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/dixulolenajajejir.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6af2b4b78c871c43b4b7ebbee651429a/nujisipagakidixizutu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/lemupan.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/31726803307.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/84237621123.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/79443733211.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/patuxivadeperen.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/jodalodusagesixeka.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360ed605e16.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/82619839060.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/mebifobetenat.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/lanapudafebinejobe.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/8899135299.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_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 19064 bytes
SHA-256: 95991a516c2b5c41d3408315fdff6c9a9ebf068c626f43969bb3acf9252b36c8
font_01_sfnt_off00011d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13593 11224 bytes
SHA-256: d4c06bfb099380d61d1e12f29afc32f15ec45d656f0a8ed0daed0df084162708