Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c3143506ec27f8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 15:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de9f4b670097efb3362bff289ec4ad01 SHA-1: de0f3c4d77386c4a0fd148502a6eb08b3648ebd2 SHA-256: 82c3143506ec27f8ffa265801900a930751982c9b95f93fbeb4b5f941fcda081
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. The primary attack pattern involves luring users to click these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce769d6e103---wabogalaradagijede.pdf In PDF document text
    • http://almar-bus.pl/userfiles/file/jonotu.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/66201364705.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/e2a8027016317a4c9d568ae7038a4cbb/15225137771.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/87126587429.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/16760700716797495ba2951b6ab2c557/takawixixivexevowodel.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/39287247702.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/18179463787.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/29144354871.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e91c408e4---nudilosa.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4447f2ba---79648087714.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/supagemakofodomubawidulo.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/kunoketizanivedike.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908cd35d366---48603348535.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/1971937149.pdfIn PDF document text
    • https://menu2uplus.com/images/file/pisujik.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6f37c2dd56886a90f9f5c29e82a70b8f/muwedolapuvamibozeju.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/zuxukamadefuzi.pdfIn PDF document text
    • http://hydrem.ru/images/file/99250003577.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/96275809649.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/66747038213.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6adcc6e69e0cb417275883b8d42e649b/29528229409.pdfIn PDF document text
    • http://tcihk.com/userfiles/69457162990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=contractions+worksheet+1st+grade+freePDF 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 10968 bytes
SHA-256: f96c3b7b8e9082608c0bf727fde1e31e858c80dfdf416cab1e4301e64b774589
font_01_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 16700 bytes
SHA-256: ef00d2488f60a2adee9cf20c23384d84b4573e9495adbb070678945cef246038
font_02_sfnt_off00011abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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