Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b71349536ff394…

MALICIOUS

PDF

187.3 KB Created: 2021-07-07 00:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b31be4585de355102ebe82cdf720f76 SHA-1: 569499c47e547475fd5004cb04efc6f62c0bfed2 SHA-256: a5b71349536ff394949288d0cc9e4f3ec0a602b6ab28a2362f0dae1aa1f84b92
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs hosted on compromised CMS platforms, specifically WordPress uploads. These links often point to other PDF files, suggesting a multi-stage attack or a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://strandedtattoo.net/file/6060783989.pdf
    • http://bannermaul.com/userData/board/file/45266628959.pdf
    • https://perfecthospitals.org/FCKeditor/file/mudoxejokokoluvibudozuwo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1269ecb63a80c8dde914e99772992ed0/77253532211.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4e0ff51b63053c5a07ed88b752cdfd22/29331074208.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160768a81528f4---litulorera.pdf
    • http://kammatrans.com/userfiles/files/kebozosezemotovanalutala.pdf
    • https://dovolena-jiznicechy.cz/uploads/wokevenivojex.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/xibokedavok.pdf
    • https://festival.bg/fckeditorfiles/file/66639862133.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ecdc60eb5---gevabefolepaxezijivak.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9660055f3a---fatefimawevuja.pdf
    • http://goddesshair.net/upload/users/files/22316437903.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b189d90a46---pubapuru.pdf
    • http://thunderstar.cn/userfiles/file/20210623142227759655265.pdf
    • http://goodwill.pl/userfiles/file/39052094431.pdf
    • https://nestsearch.in/admin/uploads/file/74438407061.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kgjti71iu8ah2n5c15n00jue63/90136019153.pdf
    • http://knuhpharm.kr/userfiles/file/20210621152842.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aa3e5c93a---49896963131.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1c9f96768f7dfa3647452844a862574e/18243351997.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1ab7041a87a4d53850bab7ae31ca7c0d/98572986453.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/nejodaniwekujuwadifugupo.pdf
    • http://aristosaigonhotel.com/uploads/files/37727600734.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=non+objective+image
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027cbb.bin
fe948e50264bff01e9c6e4ed09f8e47a317134d4432dbec7caa17903e6189e7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x27CBB 19372 bytes
font_01_sfnt_off0002af71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF71 16792 bytes
font_02_sfnt_off0002c788.bin
ee3a75d4bb3896697361bb5d3add645b9781682f197f8fcff6a7c33808d72e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x2C788 10572 bytes