Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bc12cfa69bbbec…

MALICIOUS

PDF

81.5 KB Created: 2021-08-26 02:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e0a85d2f6651509a81809609f42aded SHA-1: 29d29b4e62932f4ad878ad941a0ecdf4ea6ea3c3 SHA-256: 43bc12cfa69bbbec5c4a8e516d4cf3d77ba28cb26458801b686b3c9cdbd4fbfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected 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 multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/lufiwamibegowetagadodapiw.pdf
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/seluxiboxobaka.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/18226793479.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa5430524---fujirufepir.pdf
    • http://tzoetemondje.be/uploads/files/6151455022.pdf
    • https://studiopros.com/userfiles/file/
    • https://naves.cz/res/file/xaxavugepalifibit.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d1ce4968a0d2bb0e3a76dec6bb77c9d1/gabajolevigugo.pdf
    • http://pozitron-s.ru/userfiles/file/mudozaduwol.pdf
    • https://taevlingar.se/images/pages/file/juremenowoxufegudizoz.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8ae530d6e---nezisofus.pdf
    • http://leebyunghun.org/new/upload/board/files/49104932680.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7b315f76b229c83232b867baa40c393b/56575038733.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fc2411fe8ccd3aa15723f3eb379e4248/ladat.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ffe7154c2---vavelibosud.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090e714d7058---jiraneniru.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5dh30kq05rds7komvhtnc8jvpi/nepupixiwexiruxujexeware.pdf
    • http://kimandyoo.com/userfiles/file/degafifewilonepu.pdf
    • https://rieker-consulting.eu/files/file/82373356579.pdf
    • http://yossy.biz/userfiles/file/65623882105.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/t2ap6m1esk3ovsd2jn1tj6m395/fogaluronon.pdf
    • https://bettyloupaints.com/userfiles/files/55818310188.pdf
    • http://dolphinegypt.net/userfiles/file/lifefu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=normal+heart+rate+for+child+age+12
    • 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_off0000dc03.bin
0319c6d9b4504d21e27bcc64a3b09436d5978e9cdaa98090f092dab1dd5c2e64
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 16828 bytes
font_01_sfnt_off00010784.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 16792 bytes
font_02_sfnt_off00011f9b.bin
bca56ff214035a439eec3cb96a395b182ba62e9abd6f10c0290350962aa87542
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9B 10800 bytes