Malicious PDF — malware analysis report

Static analysis result for SHA-256 b773c2b3971a2f48…

MALICIOUS

PDF

70.8 KB Created: 2021-07-07 15:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 745bcf809c997f471a1d81771fc466ff SHA-1: 714cc8ae0d40c11907d1f3d9a575224f13f9dc19 SHA-256: b773c2b3971a2f48bc904168701d6c68897cb507fe89e5516edc0c17a557c15e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a tactic to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of link farms and compromised hosting suggests a phishing or content-distribution scheme.

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 http://izumrud38.com/ckfinder/userfiles/files/maxifogofigizudolo.pdf In PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/furiromezuvidopewes.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jj0ibip11mbqne4l24dsn8rqr5/losaribewovupunuv.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a464b690e---69657880422.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/52717474102.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/3149870404.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/38922985668.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/89593721985.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/pinunikelet.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2ff9fb1044d805970bc5cfcf8e90078a/zalefevupejagazokidamemu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607078a15a24e---ruxexe.pdfIn PDF document text
    • http://armanetti.com/images/medazoke.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/vesigafuxaker.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922ebb08c81---77670588104.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c689532497a75c62ec4e4928f33fe823/68327257445.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa9e0535b7---viponujerodinobivofiz.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1e49d64df30e51189eba76b432fd9f30/21269542270.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/69001934396.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d356d1f3e67---gezapaboxuwuluwiful.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/liop2dkctogbgqssptrejmcchh/bojotijetelozux.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1624125321.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074964fdc3ae---36165183557.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/60748439086.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/22272737721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pre+calculus+textbook+answersPDF 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_off0000b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 10652 bytes
SHA-256: ae0bf6859b2ece392619c95f3895477f18325e50421c7276e8a9dd55ef2f587b
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 15852 bytes
SHA-256: ae58505522b3a865a69beb6fa1f008c823caca6cd8b9246228569db99dfd7c3f
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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