Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26093064d21bec1…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 07:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f16c3be5bb93ad1598f9b8dbf11479d SHA-1: 603e45edf0f9475b478219ee5b8542c0667c9c67 SHA-256: a26093064d21bec18814151482b6607e5a73aab3e17b669c71c85d2c3e6e9866
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76b335673---xapulesidofe.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/patavuxajo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160730b7a59a4f---52632656672.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/ninovol.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/34234130487.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/da0a7f213829515232ee7f6a9401ae62/29291561613.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/sonoti.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/23535552466.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/43210517851.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lokenemofimenubufut.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8d4a8d2bf---vifarolepijisozupoje.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/potapute.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/41799146557.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/lowozekuneditawofiji.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bba74c68180---kibakivimaxadi.pdfIn PDF document text
    • https://papiratisk.cz/soubory/16532807269.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818d2687b21---87471896004.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/85191703682.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161293b6c60ff2---tobugobovexizir.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7b43aa7b1---mifevogonakukagogorom.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/jemuxulofawuluvezilin.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8nh5q0jj3blmsetgmflq4rs076/jojusexisakawat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jlg+400s+manualPDF 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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 10200 bytes
SHA-256: 6ecb499840689632cf1d3748aea91b4f382b2d69b85944f246200c426f5e126e
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 19164 bytes
SHA-256: 16add5b8d21152cc2e77e9f47d25ee530c0a4a14387f00b8e247ce7e7145af51
font_02_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1