Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6913c5937741b0…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 17:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 155a626bd13859e0f9989feef9cfcdd6 SHA-1: 4cd1cfe5ce03d058d21dc75fb427f7e3f2fe1c89 SHA-256: 2b6913c5937741b03f285e4d8979ba5313659926280ba605e76fdcf8f01e46cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. Additionally, numerous URLs were extracted, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dentistturkey.com/image/files/ruburigoxudasoguge.pdf In PDF document text
    • http://chandigarhdatarecovery.com/files/file/semowewiragid.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/78209467726.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/49190600221.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd3021cc917071addeacbe21940ad91c/25392764955.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49f23b377---nitirafofusuretimiziposib.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/zemedon.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/joxasagaku.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed964bee61---46514635437.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/kofixoxoxasuguk.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/f257dd6fa67f013a89742b27620a0070/75443400477.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076197937f12---33700398445.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/medemozokivudixaju.pdfIn PDF document text
    • http://domuran.pl/files/file/litafis.pdfIn PDF document text
    • http://willbramephotography.com/15244891910.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74a6bc5f46798b170e2f519d35790cec/28297714640.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/1403434199.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/boxusotesobujutetovamurar.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/javukakipigavaforiw.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/65508124157.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/53175321442.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/972e177fcff6e493acfac58f7353f7bb/64086680207.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64aa5c72db---vituzigute.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c211d577e41---52220890016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=auto+repair+dummies+pdfPDF 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_off0000bbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 10588 bytes
SHA-256: da75fb447fb8b7b552fd4bb9489ccd4be0366d26725177bad90e491cafa93d33
font_02_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 16848 bytes
SHA-256: 6d8bff6ee889d29157f769b38a60e5fc9de593e743164d96ae9552b5f34f0aab