Malicious PDF — malware analysis report

Static analysis result for SHA-256 2638abe74af0d2f0…

MALICIOUS

PDF

75.3 KB Created: 2021-08-28 08:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78a7e72990efcb4392c2ba1780dc29a8 SHA-1: 3c461ddbfefd75b086e49329fded16f29d60cccf SHA-256: 2638abe74af0d2f0c6dd529e0494c0bb9bb70ae1e9cc63294d3f937c722c984a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings point to a malicious document leveraging external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc6032a376---78841862249.pdf In PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/doxodoxasoven.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/xatuwupofujegizizemos.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//rixinapoguso.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210802112832_16e3i0.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160898d9b9bdac---kefunotu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/35510465873.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/32efc0a9a142ab57c1fc964251ce2bc0/50489327955.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/59eb3189d9bc57c284b058ed329e3c84/tajizukub.pdfIn PDF document text
    • https://12tiga.com/contents//files/79506689905.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160935ed461985---pimixiz.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4ba8o1au6kop3agjik2fha8gf1/nidifokirevowag.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/85c0040430d19a8eb9615e6fb62bf4d5/69567171753.pdfIn PDF document text
    • http://aven.su/userfiles/file/soserizipukufasunajuwa.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/6761313769.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/75964074212.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/63056240153.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/16322469819.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a3f31362---52280094374.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c31095c3d---6109836804.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qklgstfpq3cpnse19dqg36ghj2/22853374396.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/9900491541.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609cff6e11eb8---gutirijijikiropu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/afa76a8fe391770b55ffc64e8bb9423d/pitesimekubevokunotibufi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f422443---zusek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+manager%27s+job+folklore+and+factPDF link annotation
    • 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_off0000c396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 11188 bytes
SHA-256: 1d4eda65cbe0719c48396ff8d155e77c9b066ccf3c98a78f22a49fafc4901d1f
font_02_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 16136 bytes
SHA-256: 9d164b90223210176ca931c38f0ff483327ced93e48514ec952e06378eb1c56e