Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d12be883bd8380…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 00:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 30acc8f574ca8e3df14fec653eb2ba46 SHA-1: 4637a14b338c15ff4e284be9d1c7394e25804bed SHA-256: a0d12be883bd83805dbbf2801f72f79ab88fb8dac7ade4c0162fc0a9daefb466
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV also strongly suggest malicious intent. The embedded URLs point to various domains, many of which are associated with compromised WordPress sites, suggesting a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/01b20aae93b589fffa4f96d76f310e03/25631812153.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f37b5fce---76843356925.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/gabona.pdfIn PDF document text
    • https://anfauglir.com/images/file/20481645053.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/75131131930ba02b6270cfa713a8c1ed/begagevorefelod.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b47e372802a2fbbad5dd6b728e10c9b5/57713983125.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210610_6E8070C46F79E7C1.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/61bb55593f2208b99c180acb6fcd3a46/wumejinitirukepava.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2e191a44d---wefikogafo.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210604/file/72679463051.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/direretekavixuka.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dbfac6039---35240315877.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/duxula.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/imk10isf00nv2mgf31l15uipeo/91713024001.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/tawenufofulerepofixoku.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/4354399760.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4c10105d3---39608808776.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/81fef84f18054d2b1eba99558dbd77f0/6261536397.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sijajopopanamewen.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/1443108578.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a710e9b06f3---funuwawele.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2ea6e2adaec34d87c0b0aea9ed9a4a42/77699103977.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/pimazedomuw.pdfIn PDF document text
    • http://cga82.com/admin/File/78729892012.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/pubuwunokagixawabul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=differentiate+between+aims+and+objectivesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 17132 bytes
SHA-256: 80dcf79efeb60740e2c32693a54015b184e5307209adba86c8b031f12d116166
font_01_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 11012 bytes
SHA-256: a7cc71f8d7f1dc0bbb827cdaf6573c07b9d8056de775086a56eb9353ba49b1fb
font_02_sfnt_off00013b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1