Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fa1da7d7d6de02…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 21:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43cd1568afeff7ae7c3badbb0859d6ce SHA-1: 16eceda0b340a4efa4e356fbd8ea0cb78d1610c7 SHA-256: 11fa1da7d7d6de02555b4db2424d2945be24d2b41e109579c25023bbb0c7838e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=wwe+empire+game PDF link annotation
    • https://netiko.ge/img/Data/file/jijijikatadejejizijopela.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/putemisolaxeliwigoxo.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///zadudiwapomuzukukukekadog.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/lixagepofuxozinodelovisob.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/8023754936.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/69533295860.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/22847725200.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614015b7d4479---vakufevu.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/lesirifukusunokelebefim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477dc788f3---66730854941.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9f15066e---63414559043.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144407139122---xitegilafi.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210914010256_738590.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/90951795530.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abef3dadd7---nisamuregolinare.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/jimodavo.pdfIn PDF document text
    • https://angkagenap.com/contents/files/21769976005.pdfIn PDF document text
    • https://fishboat.hr/files/jowubolewomekodugiripipi.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/bunifufivojuwis.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/53260352740.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/vufan.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_off0000ba3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24E 16188 bytes
SHA-256: a137931c85a7dbbe339438eb1b716236b83b2f1276a371e8f98503f79abef2e8
font_02_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10136 bytes
SHA-256: e64dac2ea47ef313eed44e6ad8ee80af3686b2687dce51aa2e2539389667631c