Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a41c7e26f961cf4…

MALICIOUS

PDF

88.6 KB Created: 2021-08-15 21:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6688a7fd5f851d20568c85fb93980229 SHA-1: 5db9b3bbcebb3456144a7d28ab06e51a41ba1fb0 SHA-256: 1a41c7e26f961cf4b3c2ced37aa920c3a2bd55a7f70abb13fbb68fb15ec44429
156 Risk Score

Malware Insights

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

The file is a malicious PDF that leverages a link farm to direct users to potentially malicious websites. Heuristics indicate the PDF contains a link farm on disposable hosting and points to compromised CMS upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=formulaire+attestation+employeur+destin%C3%A9e+%C3%A0+pole+emploi+pdf PDF link annotation
    • http://hani-bee.com/userfiles/files/vonogobipimumamil.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bbf4a300316713e6be50a01e73d8c33d/guruxajovizazejas.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/fawifefet.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/pabawiranosugujek.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/gapowunobetu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhlqb2a7vf73856ifls0d98pi0/lifewomosu.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/23638853502.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/1195f6d73fc1d89c363902d106f8e95b/lutuwugedokidoronazav.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/fevawadirafobaxupeminigof.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f1ec7cdb9---15853550216.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/dalovebib.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36ed1dd51---89423109144.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/kimuvoxuxajufazabeju.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/34635531469.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/47831754132.pdfIn PDF document text
    • http://altinay-law.com/images/file/88596829294.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/631194843.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/robowa.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/523c3f02ec6a00f3e5501f9a5e2e669d/5818799373.pdfIn PDF document text
    • https://nilsagame.com/calisma2/files/uploads/3098380060.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ce38000b7136637be1fed3535c0678e4/2947346263.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/nukuninagerotu.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/butijalisixo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ea55db09---95794717408.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_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 11188 bytes
SHA-256: 9d967a21733bee93e5ee18faff3186624291b4a027c7c4d41320c4922244583f
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 17800 bytes
SHA-256: ffd2165600f1b58e5a44b979b405bd677833bcc7b3e49c12d3c18de2d0fc1218
font_02_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1