Malicious PDF — malware analysis report

Static analysis result for SHA-256 8179d5a0d8f2c313…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 02:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c834a7d7b7a27ed086756be40301cb80 SHA-1: 5850e42d1506e6976a87be083c2c0d51d592e63d SHA-256: 8179d5a0d8f2c313799a6213e9ee9739468cd06aef79629920ec9fd9607fe60a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised WordPress sites and disposable hosting domains. These links likely lead to further malicious content or phishing pages, aiming to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://immobilieninvestors.eu/userfiles/file/jelojojatonedadipi.pdf In PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/05245d0e2e7670d7ce6cfc33b39b469c/zadijutasoweguziwov.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/jepejifoxubopadujibovix.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/9962162520.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96b6c79a4---waxagiwitorojufora.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/hvs13glckv3qk07qj9se3efj2s/wuwuka.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6bce3413---powim.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/xepuzururejemeruxuluvi.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/44589955721.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/vedowutivowuwine.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/jegetojefuzamo.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/wilubemejotaresil.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9e44c1622236e9d8a6f387134b9ee545/19229035513.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/37104179361.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/76880530107.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/eedb57a3f1d79f7e842961451368b1ba/vejajiri.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/15899129390.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/tidexisazujododategoden.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210808_B903D9010CF252CC.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b0f85eb9f---zefufonisixijapalos.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfa9b36ff---61729118094.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd6aae9ef---23074909238.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/38110289992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sequencing+numbers+worksheetsPDF 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_off0000d28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28A 16184 bytes
SHA-256: 0676503b60098505d5370bafd0230131aafcc2340d6269522073daf16f714b13
font_01_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 11108 bytes
SHA-256: 8bfa32edb000e0900523b61aa593bd283e738030dbd81ca77c932406b674ea74
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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