Malicious PDF — malware analysis report

Static analysis result for SHA-256 c283cb2e3a392170…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 13:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f564bf57af19eab3e4fcb1033437fbb9 SHA-1: 64a7479b7ce94e06ed6cdb2aaf171932d1712e8a SHA-256: c283cb2e3a3921705c182f885c9354b8eda700c9778cbcd00d265a9722d561cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links, including those with UTM parameters, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://staractivecollection.com/resimler/site/files/nefafilekewexapofo.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb708dddf---xusowumoxe.pdf
    • http://abwingsbuffalo.com/uploads/files/24889096217.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131b9ebd65b6---14994848576.pdf
    • https://fa-vietnam.com/webroot/img/files/24139754180.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/wowalabinatolosipukuzu.pdf
    • http://infunplastic.com/d/files/14024655240.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/jimabuxusujikedi.pdf
    • http://ski-experience-japan.com/images/blog/file/geroguwuzulikugeludetusu.pdf
    • http://arabstina.com/ckfinder/userfiles/files/lemedifilurorowagalukunu.pdf
    • http://artstudiodesign.it/userfiles/files/vonoz.pdf
    • http://skupka23.ru/upload/m/babogusovurogef.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210901131557.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/34e2052dfab429f72590d88b44098dd8/lijopijage.pdf
    • https://dzido.pl/userfiles/file/xitifepoxupup.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/52631531647.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8be5fb0ff673ec2b43876c3d404f7de3/bewugadelile.pdf
    • http://currycornersugarland.com/admin/images/file/76955602064.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614625eb28cc2---timapebavoduxegizidofap.pdf
    • http://rydelko.pl/userfiles/file/mumebinebalofugalelu.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0299ecc7f---libisoxajavomopobasak.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/1642063937.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea12f0c0b2---76608466486.pdf
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/18543518086.pdf
    • https://equinox-e.com/upload/UserFiles/file/70426367443.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+android+play+with+friends
    • 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_off0000dd3a.bin
7165b17b35cf8bc4a57cfe9aff828c4cf3aa0e6f47e23cc1ce38217427678bb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 17388 bytes
font_01_sfnt_off00010a46.bin
60313cdee43bba2bcf1b0716b08c025f4bc8d2464cc875f4d8cac77b7615cddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 10908 bytes
font_02_sfnt_off0001238a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 16792 bytes