Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e1e16645efb5f9…

MALICIOUS

PDF

69.9 KB Created: 2021-09-19 08:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47d523ffe620f244f7f2d3f6290382b1 SHA-1: d6869d058e1cf1e4b4844baeaa3fcfe270f5d953 SHA-256: 50e1e16645efb5f9a93860ee16f59e0f35ae0d1664eca606bd38b10902b4f999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=pubg+lite+apk+combo', suggest a lure to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=pubg+lite+apk+combo PDF link annotation
    • http://onthebroadway.com/CPD/adminpanel/upload/file/65213646163.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/80052163266.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2c2b323bfa2eb25f905274949a06c74c/janemodemesosemonozu.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/silapuxobajobogixugoveba.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/5881378415.pdfIn PDF document text
    • http://osayit.com/images/file/bamuvoz.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/38825918219.pdfIn PDF document text
    • http://termocity.by/pics/files/gopatidegelugoze.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68e6afd3d---popuraruzutix.pdfIn PDF document text
    • http://belean.pl/userfiles/file/leramoburek.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210902122500.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/nafudugutezelef.pdfIn PDF document text
    • http://lachina.cn/upload/file/4510678403.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/66335027431.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef77e6b1---tosinorotuvigi.pdfIn PDF document text
    • http://scsychem.com/upload/files/28490842448.pdfIn PDF document text
    • http://opersan.com/file/10421999728.pdfIn PDF document text
    • http://shesob.com/file/files/17109576102.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909052702199.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614000e09b230---33674563688.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090814002449.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/97337537225.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/barupitewalirowabufotir.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/livosisekemu.pdfIn PDF document text
    • 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 10680 bytes
SHA-256: f5190784e67de7c3f604c74d68978132df4ae1352cb2f7199bfea7d9551b470a
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 14856 bytes
SHA-256: c2002a7999db5d1331b3697053d84ee587820b7582fce9c40f8a510d150c6a5e
font_02_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1