Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c09aaa04b62c76…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 12:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 415a3a80b60385e9434977e9c287faa4 SHA-1: ec914469779ed4ac3ee425a24be03b1518101686 SHA-256: 19c09aaa04b62c76bc0d983c1e06ae7e8aee4ecb943f122ad33ba77adff7bb84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://dildendilecevirievi.com/upload/ckfinder/files/12287433262.pdf In PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2ebc04f11949f972f11fec3c056229b9/xukifexiku.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8253c6f3---48909815679.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/regupogaxizuletetujixoved.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/66158762888.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/75464005237.pdfIn PDF document text
    • http://placc.info/up_image/88129028085.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/1ef95e2c568cbfe5041b0fe1e5823606/kekara.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/48891956274.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nusepekawemujo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d86a0227---10709744711.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc66862ed---ponenijunoxemijefapewupes.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/2c0fc8018b758792e811c6ed0af3880a/46630594435.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/49199761701.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cc014347502eacc5a4f2307bbaa47a26/sovatigav.pdfIn PDF document text
    • https://lesura.net/userfiles/file/sevazo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/45087462034.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8717c978b---doxesunipawisinifa.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/11801439392.pdfIn PDF document text
    • https://buka.ru/sadm_files/bujutonexuvonadobufoxaman.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/18521379585.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-6/20210806033139251008.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/duvimekitozujumodowa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f896848ee---66394628443.pdfIn PDF document text
    • https://susta.vn/userfiles/file/9593368494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=applications+of+fluid+dynamics+in+real+life+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_off0000e186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE186 17188 bytes
SHA-256: 03513ba52eb0a60224f36913f6fbdb8c3420172c739a6b26cf6a0ea24616d635
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 10976 bytes
SHA-256: df452d2f84ef1016910d41c18284b3cd8b4e59d6a577500646bfc35e886d5037

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