Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfea626e5647538…

MALICIOUS

PDF

91.8 KB Created: 2021-07-02 21:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 02429bccb9eae8a4fbfb1926157df7f8 SHA-1: 24c7af6f37879c0b1847d75b2c7a9632e414095d SHA-256: 1cfea626e5647538ea8b6a700cfcd042cef7151b726368e2959195eb3f214ad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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 http://szymonadamczyk.pl/uploads/fck/file/bivima.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/jabenupaferejo.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/87ba81ff48c30cd684525b0f7379dd1c/razapojinubawalowuna.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637adea2f2---wofenafasepug.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95b71d595---regigimolijubofifukatipag.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/76235720046.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/4187609711.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/9fc71e1d6f288ba74976ecb3f61c5c58/16984192686.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607802dae4ee4---paforopubazedeweras.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0c6abish9r3d6c80dorpqefuf1/68077902653.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/mevazoro.pdfIn PDF document text
    • http://szwygs.com/upload/89296308496.pdfIn PDF document text
    • http://matras-devison.com/upload/file/55893733288.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/146e36ffc4b4c49750256611f8d70ea9/35341672722.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3c661dbdb---tovumijitagoteloji.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe78ef189e---42411744094.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721533cb408---7637616077.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/88335368077.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfb5f3d42d---15824026803.pdfIn PDF document text
    • http://carszana.com/image/upload/File/veratajifozukarujoxegum.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/44367935165.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/sanevagezekopalab.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d844d12ba---tifiwivetavizitudafub.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/desasedewajonarodabo.pdfIn PDF document text
    • https://sca-kc.net/scauserfiles/files/85388137414.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/tigunifavox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=last+day+on+earth+download+androidPDF 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_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 18040 bytes
SHA-256: 3e46905e20712e7a6a1f0f0fd9672005065ff4f0e8c555dfc48bf2a6fb727ab5
font_01_sfnt_off00011b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B02 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14924 10504 bytes
SHA-256: a8eef60505d0494b0f6346184c575dfe0376ed4eb27cdd3f951dae3a4bf35e46

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