Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd625575fa2f6829…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 12:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d8cd2e20076d94d02d55349bac3842a SHA-1: 4fc9f8efa6988ac8b7d63cf3c75d9d0d66ada837 SHA-256: bd625575fa2f68293ac1f60d003ad6e77c35a66378c89b60147716864ad04088
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rzfmuhasebe.com/userfiles/file/37894407822.pdf In PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/17776964237.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18c095ba4---85073570074.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/15e8e629dade1bb576c8a763348bfbae/14679785465.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/38402006190.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/posufexa.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/62203528324.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/58789906202.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/11245938454.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/movapuvunejinemu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f2484c529---nojiwapugilizazofo.pdfIn PDF document text
    • https://phukienbep.net/media/files/retinoraxiwozutuwizag.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/45e5b77v2h3kosa1qtpo9uum84/zuferaxoxubizujuw.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b005964957---56002826177.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/lavularowepenedidi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b3b531bf0---37774787990.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/44baa73b1871774e31f527f6fffdaaf6/pagiraziliwuvawaloganade.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dfc553bfd---bixiduwezevevuwekasujo.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/wafemifenafafizarobadaxiv.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bc8a12d52d0faed09ec8a39418106cac/56041842327.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/28304522050.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5260ec4ccf---78102601757.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a4556dbf8---tefugubovataxujena.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/91222340893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=traumatismo+abdominal+definicion+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_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 20256 bytes
SHA-256: fbd2389467506d52aa16c4bc240418d767f30c65dde943bcde4e6e9f935ed9f4
font_02_sfnt_off0001557a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557A 10984 bytes
SHA-256: 07818a65adab41bb936936f782a6b270baf64374298a859b06bb39cf3c791589

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