Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bba2f77c9fd819…

MALICIOUS

PDF

92.1 KB Created: 2021-09-12 08:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 480ef5301e4ab804d28f9d9addb9af14 SHA-1: eb0c43bc67c716403b4184cc794478182acd47e1 SHA-256: 80bba2f77c9fd819862fe763406af2ed6047207e597b66aba59190c75474166e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous unknown URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/39a64a560a913b03e72914e339f03614/23078982462.pdf In PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/75313605984.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a6d8ff57ca3d77d21be30f7172268b79/40055381487.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/99016239898.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/44238376335.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/8j95ra4isfqpeem6uqo7bfjtg4/66720429454.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/60667266438.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/vukipoxutonexexu.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/fewizufakokekesazewameba.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f5f419c740cab0d82770a943a53aa852/vomuwobisujenijov.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/5585100846.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kefewekatovezu.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/govawurezedafu.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210910132633_385078324.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h4sd8jq3sh6mrk2o19rcvhoajk/81109469740.pdfIn PDF document text
    • https://megashina24.ru/files/files/lejuwugosafotetu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60bd846c3---ledeguwovo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/42256043763.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/3142627350.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/rifavurupobi.pdfIn PDF document text
    • https://harmony.im/userfiles/file/18653680377.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/32276396200.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/97479585710.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d550ee74be---44018911797.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/7140755594.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/zirokoxej.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/limogoxigajamuzil.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9ab69897---79296532505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=positive+and+negative+aspects+of+social+mediaPDF 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_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 18292 bytes
SHA-256: 8fcc8439e4c79de16694891588962f7731bac92eab1509b585fbd8b9bfcb2574
font_02_sfnt_off000148df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DF 10932 bytes
SHA-256: 73cee7b0079a2bbd65e83c015b3818c5ae6a16edc8b6c26faeb14955951904a8