Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32893eab604013e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 19:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c498e2601ef7cc384932e5b129b9f18 SHA-1: 9b902959b049b30cc1fe527b8a3da03df6c199ae SHA-256: a32893eab604013e2e5b3db6a35d0ab14430b5d8a822f562e5eb196f91e1647b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs, some hosted on compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=auto+or+manual+transmission+fluid PDF link annotation
    • https://condicionamentofisico.com/arquivos/file/21566089527.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096880cef05c---ruwofelifavij.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/totawewenebi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/a1lh6uj9lt0fiom3krflc78of2/mimasiwutepumike.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a14e9945073---lesodurivawejoril.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/juzotofup.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zefufijud.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/97517153488.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3ee2f2d5a---kitavugalodobamifofofux.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/59074255881.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce7d485995---49126036869.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd00479d7e5---pivad.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lagifapa.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/74091567005.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wemomorinavupuvokuxorup.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/84553ca7825f8ce533ec2b6f00707a48/40725834986.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c307255b899---25740362273.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080efc65a649---liwebepegugazonuz.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f55900247---vusimowebirubusaminures.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/62815769077.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37bea1e8b---6312926157.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076219481a87---10002951243.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a62b33166---91522182406.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91cfd7958---91073201741.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/83789785852.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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 18076 bytes
SHA-256: 344466014bc5b37e424c549f3055d0e9dca2e1479f9a242187b011ce58672f73
font_01_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 10464 bytes
SHA-256: 06118fae5e1032a3f7aa6e3e22fa898baaf1a7c1a773bcd78326353dcd7d0516

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