Malicious PDF — malware analysis report

Static analysis result for SHA-256 3149264fb9d2baca…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 12:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21757751f8203b57299e937887afa272 SHA-1: a95d02909f280c88679ba0020dc21dcf7d800139 SHA-256: 3149264fb9d2baca9df2f71e346bdff610da7346b231afe7146b7f19ced646aa
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a 'utm_term' parameter in one URL further supports a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=mobogenie+free+download+for+android+games PDF link annotation
    • http://www.oomewatersport.nl/upload/files/jadonibenonuwawuzeli.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/tunibepufebawupiw.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/36448742713.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/43841843294.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/60216711529.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/95112305819.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ade0405fb---97060541051.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109140456126082.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/30434478591.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/55075712433.pdfIn PDF document text
    • http://tcihk.com/userfiles/silagomuxafuvumubap.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/67933159121.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/rowefepodaxezuzi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e7f67025d6d80e841fb5fbd918193b16/filegisurinixi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/403f9c4ac1f10979b611e933fdb0aeb0/tupotupabusekefuwixuzufaf.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/duzilemedopogefalemewowe.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/10214799334.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/keladuruvu.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/3678287908.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/remoganobatekojabono.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/23453800941.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/23816532814.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2c649c67---rejaguwuridata.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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 14976 bytes
SHA-256: 120476b179c25ed602f13862d4fba218761399ed389bb0d1495df4d8b6f06cb1
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10816 bytes
SHA-256: 1a3f8bbbb92907cdb9b982e36af524f6484d012bd552be916e0af53308fe4862

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