Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb57e0a8d57d6ef…

MALICIOUS

PDF

81.6 KB Created: 2021-08-12 17:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de87bf528fa5bd4de9eb4430fcd9f5f2 SHA-1: cbcdc3c478140936bfd1bc51c391d521ef4b03e3 SHA-256: 9bb57e0a8d57d6ef29cc9e74199530ba797bd5d0ff19520c422367f189b036d9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785ee720d8e---nidadapefadikurawedoka.pdf In PDF document text
    • http://phannhan.vn/files/usersfiles/files/lisosakekunisesapijakuxu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086028fc89f2---bobivonuxemodonazaxi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528190520.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/tuluvonutamewusuvolasu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160967d38ab9c1---76857251334.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/kipudurezeb.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/butezisize.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7ghs8sl9tpio5f60b5oedrgggf/26235835343.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2c4d1088---fumavodevuxeno.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/mizarutujegij.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a489b1ca---fudixapolizobifinifakuj.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e8b2a4451fc2436a2cf0fbe7e1decbf/vixisiv.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5044b78022fae41d348d5f3cdd2eae38/92653158685.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/5628381188.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/xiruxakijusowitixopepum.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/lesigusuzazavigoju.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/fesijizokefidapoz.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/55090f003727c3b188a19eaeca977e49/45703346794.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/rakabolemaregup.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210810232950031290zcu88i0hxon0.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/3866765237.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c26b11b9c---dafidotez.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/vajiromepugenotite.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/aab7e52eb472477fb8a54d742752d245/76818699559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=john+deere+sabre+1538+manualPDF 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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 17276 bytes
SHA-256: feab28b77587cf8e8ec40a5a3f51f6a5e3c1daf302e464b650fcee380823af6b
font_02_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 11120 bytes
SHA-256: 6d46bd0e8b59bf8e06c0cdd3e0e0a17b8c78f4716855866b24370c96c38590bb