Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f8bac6004b4c98…

MALICIOUS

PDF

98.0 KB Created: 2021-09-05 23:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1af0e8a74ffbd2ae1799e76f35d440bc SHA-1: d281817ebe14580057b517d0dd20fab6eacde62c SHA-256: 34f8bac6004b4c98e48128510804e68c473adf607f612d097e15cf4c9f55be90
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=caracteristicas+de+un+protocolo+de+investigacion+pdf PDF link annotation
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/gepemegatejiretimozi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/6525728649.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38a7ead7a699acd0b697623911da9558/fojuxuxipewam.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160928e5f45fab---furekasapotedetawawizew.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6bdb398cb318747785ebef18cb660d11/pomokezawasijuvawite.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a347e08c---dinisejifupokumasoxo.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/98338975441.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zinanareporubaxazobo.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/84354625715.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/tozasiwuzulumuroninelevum.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/52779627179.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/zuzepuzil.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f5aed86b---mufafedavesetipujik.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e816e7c7098---89336995100.pdfIn PDF document text
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/86757857027.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zeserugalevilajepijob.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/32718808685.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b87a46b2---lozepenoletuwagujigu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f03123a83f3b697a679c8085f575a387/2484743320.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/82952306285.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/walufadafisinaso.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/49105061035.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/37840394022.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_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 18880 bytes
SHA-256: 713abb92f4d41b1ff1385cff7fa26e5c5bd8dc37b513c9405399822e0ab97c12
font_01_sfnt_off0001482e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16045 10992 bytes
SHA-256: 4fa96fcf6690f4cdda47ca60c0fe1a477f4203273d7af29087ddd8e51f39cf3e

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