Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a20e5ed6eb2d66…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 14:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6825e0985bd8d86e12776d7252f4d55e SHA-1: 76b8ef027e04baf506c6e9a484bf2e9738dce5d5 SHA-256: 37a20e5ed6eb2d66e5c291b1d7721196eba7cdbfae204afc8d05634a669bfcf8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised websites, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=boost+app+apk+download PDF link annotation
    • http://mcenterdk.ru/fck_editor_files/files/jufapetufe.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/pumosamidusuza.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/83218314112.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/67648248967.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c254329497541e5b4f595885af9b2687/pekij.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/279684854613783db11bd3.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/tiden.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ranawelusizotasim.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/45216330588.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/64076281339.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/vufoxegubinasepu.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/97678963917.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/19689148132.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909143225.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/wanefuxoraderujajiraz.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/zisolelejeri.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134f3c4d6de3---63358044836.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/11275382732.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/refibiwesapimowo.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/lufawubozibo.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/vudozewiregade.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/pulutew.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139deaa8848a---43184178168.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3306228b49d2cfbd55805d68b32e056e/88896559337.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/56787400807.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/23494272209.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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 10292 bytes
SHA-256: a1f4368574ac9c97bef91f87979121537d75b16b0715f081470b2bbf533feefd
font_02_sfnt_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 18404 bytes
SHA-256: 198f36cd7f3ae2a131f47e8b5f2dd6d1caed9b314ce42a330846dc83f4233ee6

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