Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5a1cbf21cb09c7…

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 12:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1ab07c8581dd1ae0406ef95b7c737d2c SHA-1: 1f8e35284327c54982ada98c57bae9ad8eb34806 SHA-256: ca5a1cbf21cb09c7afeeb25b5e8653aa41e6f368eaa6da8e5b42f4a84b1b231a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely intended to lure users into clicking malicious links. The primary purpose appears to be directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=successful+quotes+in+english PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744bdead88e---bilejusonivasoxexowuw.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160912c0f6ebeb---zekimadusojoziloneximasa.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0b9dad50---jovipupusefuxelidubonun.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7f3d4cd7---vipasegenusi.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/52275025388.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fb1d513a---61223741662.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e431f233dcbbcf97090eed928ca71362/darebuvelibijuzobonedevi.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/152163ccbb0d23c411bf9c5043bcdbf2/rewowemejerogavabuwurobut.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f54b86257b9999fceb9cd56166d7d4c9/nujavonapadozapib.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/katimovo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/padufaxevirolosi.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a84e724488b5b568180189aaaae1b2d4/logaputogufobijekegesi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf4b6b5b8---dazoraza.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/menuxedejojuvotefof.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/4982314542.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089d0a9ab020---34308934043.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16216883221249.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2s3pkaih5avcan6fmhklfbb56v/jepaviluxo.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa57bdbb434---besixujofugiwa.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/73811893190.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834337a09cd---lomipajofupilenegegas.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b21928a9---69671266086.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/0p7tkn8klpi987n6g5kf8qfe88/76777233546.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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 17380 bytes
SHA-256: 288a063284b6cbfd18d0d9df9aebf2da8b694798976a79ac2103f62cdcd98988
font_01_sfnt_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 10676 bytes
SHA-256: c3b400c3f22f9080cb613b09243c70d835049708adca12519de8196eb077b612
font_02_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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