Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b505c1f95fcbd30…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 05:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a2b1bebcfee87b0201309bd402db010 SHA-1: 0c3d8322bda37d9b30b70d1452e3508616c8c4ef SHA-256: 9b505c1f95fcbd30526804c767ca5777ef0838f8e3b2d0fb3993caacf40c8400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=how+to+clear+cached+data+on+android PDF link annotation
    • https://bahamianbrewery.com/ckfinder/userfiles/files/23002899965.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16982552193.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nanipi.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/73868417626.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/saradopura.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/kalonibuxirepivobuvigez.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/14973781598.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/22298170405.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/92953343984.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/69301627046.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd638c7bd---rosejeket.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/35189021368.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0ac3bf3dbceb4922669c2b4e7ecd26e8/56681477434.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/12186637214.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/33566583159.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/farifapozanujixupa.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/810157c9bbc6fec6d6a9d4cd1e7495bc/21629708184.pdfIn PDF document text
    • http://www.agot.pl/upload/file/weradupon.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/02ov9hafsbgel8dej979eitgcp/xeluxuzasino.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/2183697572.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/bivezutebano.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210908181039.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/76615015437.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/pazopifage.pdfIn PDF document text
    • 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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 10376 bytes
SHA-256: d490f5b470496a267030a361c94c217715618b03a66d0c12031543005cb8d76e
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 18172 bytes
SHA-256: 7826b93bba2cfe86188dcd155f9063ce2c95b43fe0f4390920f3315fd0914bbc
font_02_sfnt_off0001341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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