Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aff9b93cc9185c3…

MALICIOUS

PDF

92.2 KB Created: 2021-09-07 06:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 059ab169758fd6ba699502007071964c SHA-1: cc17413f780bcb9837a501866e4d3051c818dadb SHA-256: 0aff9b93cc9185c37b7bf0c8d1a23d8e8d6ba06a457cfb144ec6bfb04997bb3e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fcec4b1fe---niduwusedofuzonovas.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f03c2d3bc---92382302917.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vd6gk0bh0gnd26otb6jai0u02r/32870255405.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210712_25F3156A38AB05FF.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff614947881---67741363085.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630628507.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/90350432332.pdfIn PDF document text
    • http://kbchina.de/upload/jumizozewokulitivenuw.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54415787118.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/92520220283.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/91818929770.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/78079889234.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/78900717503.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/xikoruwululela.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/61502529415.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dc981a0e2---99555757995.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/timugigimokizipej.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/07b4dfd6eee153e8c66e8eca28d01cc1/2336028755.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a3a628f99103dc00a10bee5ca93c31f7/jedob.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lekafupekusufedexijuxoral.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205a75dd61---28422264618.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/61070622888.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tunodenibemixinu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/388c54e07566fc314bb476eaef0c8244/wepezitemuzimesa.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/weselopimetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=capitalism+in+the+twenty+first+century+pdfPDF 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_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 19868 bytes
SHA-256: a4135d9dcb6caa45143f7632ebf94217ccd7fe85ad4614ddc1cacc5c252804a8
font_01_sfnt_off00013131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13131 11096 bytes
SHA-256: 6a88fbc25243b7fe60e6305ccc639e823fff4b90a220aaa8752caf9b568fc917
font_02_sfnt_off00014aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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