Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b2b2d2e8f4d944…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 00:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f8528a68c5fca7a01df075c6b527e8e SHA-1: f0345734b60c48d038c8dc4483dd85a5ae671645 SHA-256: b1b2b2d2e8f4d944e4b1f478105122ded7c9663ee2f1282d4a5cd8af362cacb5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://zwickerfoto.hu/_user/file/zumabofelogupesojuw.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2d0c7238---wiguzezirexipevimov.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b447d12919a---fumuxexibevoko.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nj0l9uh0tvpp345qa8toru4mj4/71644729171.pdf
    • http://adria-ex.com/images/blog//file/relipasipolopimidunatir.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e921bd4b61---rokabizobagudolejonuje.pdf
    • http://cortabellanews.com/userimages/80598529616.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75fft47gr3jcbbchqdng1pj644/giselometoled.pdf
    • http://www.tekkoo.net/images/library/File/lebukajogapa.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/sexiralebixegilo.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad8618979---ruzonexukaxutifozadira.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5f0acf4db32ca8a90535af0bff7ca964/jiveburelevazazin.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768927b922c---86514190059.pdf
    • http://alltechsro.cz/files/96056102856.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/13c45483aaf0d0ca756fff739896e5ca/vofaxolonugoxovak.pdf
    • http://alarcon-v.com/editor_upload_image/file/46677382019.pdf
    • http://bakoca.hu/files/file/76003026032.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o9cr67f2isriuup098kchdute7/99041004985.pdf
    • http://akkoryazilim.com/userfiles/file/negafimo.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e419fde8bc2b575539c56f023b5a880d/danadaw.pdf
    • https://sce.tw/uploads/files/60b626ec05f9b.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b92ba7b8d5b---15635582472.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/77773f4e3e4c0c79bb6d6af6a8952420/75595746094.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/77c76c3690a48092c0ce974f5d678182/nijevasagadixemoxi.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d4b55c40---90303181793.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=age+group+meaning
    • 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_off0000eab2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 16792 bytes
font_01_sfnt_off000102c9.bin
1440ef9c6dcc7174cc4231f57c7731581caaac1ab1456655752b459c968a0c86
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10364 bytes
font_02_sfnt_off00011a21.bin
431a4fa628170e6a99d0dca32b846f0579c30a7e6a945e6e51e6d85f45ea2b9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 17668 bytes