Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b57916f8e6c561…

MALICIOUS

PDF

72.6 KB Created: 2021-09-11 04:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e94bfb38a2a81532fffd545dccfae578 SHA-1: 45ab963661f69fcaa47243713b1d901882b73b03 SHA-256: 31b57916f8e6c561ed166d48573b694d1709011aef5257ddffdf95a747397f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to host malicious files for download. Heuristics indicate a high likelihood of malicious content, with ClamAV detecting it as a phishing trojan. The presence of embedded URLs and the structure of the PDF suggest an attempt to trick users into downloading further malware, potentially via JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd37c4384b---41664864770.pdf In PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/sanijanidebemisaki.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/kozenawapob.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/viwive.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7939e619---28145785344.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137398a599cb---78492308857.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/lutegugomob.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/loziditasuvebex.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/10864500004.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/97444770900.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/13272204230.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/wewonowomadodemem.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff925c610---84516670647.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613127f387a42---19891379061.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d2c3b2d2c500ab668676f2d0c17b60a2/27270421334.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pebakokexupef.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/xemabuwuxaf.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/kufoboxeduvul.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161301fcecae60---34537533869.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/xowuvumujumaxibipul.pdfIn PDF document text
    • http://espokebar.com/uploads/files/14833947190.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/vifolazupikuzefelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=thop+tv+pro+downloadPDF 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_off0000ba40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA40 10212 bytes
SHA-256: 9ac49da904cce1e751ca85af175d997ce178a227b6b41dffb56ffdbd11dab9e0
font_01_sfnt_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 17064 bytes
SHA-256: b19d3153f9a7ba64e617b13826236134706e04f3c8d7ff0e08899cfde23b26ec
font_02_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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