Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb549eeb41f0b99…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 20:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f08f3ea75d02c83f435ad63a42bc4d6 SHA-1: a494927c7714891b7ce9c2c8f913ff348ac6c589 SHA-256: bcb549eeb41f0b9947906f771f99265b9375728b632164e35b7bffa242f8acda
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to compromised CMS uploads and disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://bjbtrh.com/files/pic/file/lezimarav.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b4e5b1270df50d72ab409bca51105392/74311962345.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77851c23e9---luneserilabezesom.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1a2e95df4---49491119944.pdfIn PDF document text
    • https://kiameds.com/images/upload/files/wibuvasijetaledewexi.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/vuwurirajikigi.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/62900483259.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5ab84b96c0753f9d37fc8cb1fe1ae228/wisukemagigeb.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/32951f7a86546968f6b57e61bbaa93eb/bagixekopeduju.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/9fdd90cfa54ba2fe3ae0e870833a48a2/dogutarurorobovoxerejusen.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/todugikuzexuwatavalo.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/lemirefabewovoborupul.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/zoripepowiz.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202108271511081404.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119dd908e05a---vadowu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf3fc11274---ruxoxumanem.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd03f584fc---95421626522.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c9f7b8463---46529920340.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/16657131626.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a32ead068cd6bb137bd18fa064644139/ragirozewukawa.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/jorasitalakakofekus.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cda726858---pexavuguwifonojibew.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/58d71c625ada0ad6916a33dd8538bce6/19395979167.pdfIn PDF document text
    • http://www.depomatrial.com/file/3787757963.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/82081424324.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jk3k2on693ghk1und8v6uluocv/79448006873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=organismos+multilaterales+de+cr%C3%A9dito+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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 18548 bytes
SHA-256: 4058232778c36c1ce8e6a643fa1ac67c13a512fbc6aa546b85a7dc6739fd841e
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001204d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204D 11244 bytes
SHA-256: d752d76dc208fc9add7435934ad45ec4332b05af39dc4d8ca09c68a5f057dc1b