Malicious PDF — malware analysis report

Static analysis result for SHA-256 185cfdbee2e61a5a…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 21:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9297e2de89978c00bec1293c85a3f6dd SHA-1: 8cd9cf487642786b2937e196c1b7b756205596cb SHA-256: 185cfdbee2e61a5abfafa73812f4c09229c4892304ef467679c9fccf60ed17fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=the+seven+year+itch+play+pdf PDF link annotation
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609347bac9858---jidozedorozosidevedu.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/poretogew.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/70613336295.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cef001a04899cd38f6a79ec2584a4d3/99790244098.pdfIn PDF document text
    • https://bliznacite.com/files/20244435976.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6386805f24d7a9c807ac0ad006f96121/marozogezosobila.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/15980548884.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/wizomanosavepisido.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/p9kv57m8nms3lkeft322aslslh/wegixiwis.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/95524518156.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/25989763745.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096012f02571---dadipolaxejepo.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9094401468.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/71932238118.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/dazopumizekefisegejidusu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ebc5b6126---70419028001.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/980261558.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/94438694537.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/21322946622.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/mawabevozexeboz.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/jebopujixalizoji.pdfIn PDF document text
    • http://sergeybazarov.ru/file/perexuviduropowe.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_off0000b5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AC 15512 bytes
SHA-256: 4262cbfeac5550d2b577eb0dfd17378b49ee29984a0062df0f9ed49ab8c34a5d
font_01_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 10740 bytes
SHA-256: 7dfe5f88a69f42a076e459d8ed857fc7dca7d869d8188f8bdea88640975518db

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