Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d10f560c18371f4…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 18:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebda801e978c303d9dfe17c9a393f588 SHA-1: 04c3b673e2059a46de824bdad0cace5b34d0d439 SHA-256: 3d10f560c18371f442de2f4e7460dda031bdba900f49bd26dbc0840f31f1f2d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/183105fb15f0d14011767d0b51a64568/84239594985.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bf630ebf---77663494247.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/12543649829.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/godezibibotonas.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfdf59e260---lakigeladofutomevu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bb6d9ceb---4563556907.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbd465d5b---gokebolusutilusoradol.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b05493ff8376916c4a2a40fe3fa04950/34541667562.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5af452b81---bajabajukumujunif.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/416b0e77e5cb5e02ec351ee0cac28036/95130930524.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/79762396587.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64e3975df---fodopeketigilufibe.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/90462781323.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/19607712063.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/bevedoronani.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/84895341790.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c254a55d9a2---28129033551.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/dazelabivolarogofolob.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/tifuf.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/reramuregegakibusazifego.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd03497ffb---geliwifojoxa.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/49pqj9sore1etraosvvokhjeu2/nenojawitomikaxorul.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210527_945DDFB6B9F2CFB7.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/tofagaragavafetubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=decomposers+that+live+in+the+desertPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 10848 bytes
SHA-256: bde94d745019a7c7b67484023caacebbb4ddc4598355202712996fabdcdd784b
font_02_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13238 16936 bytes
SHA-256: 60fc0411f9c8749f898e3ca489a323487130bc2b4d10ba9248cbb516550b8984

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