Malicious PDF — malware analysis report

Static analysis result for SHA-256 868013c83d4cbc09…

MALICIOUS

PDF

92.7 KB Created: 2021-09-21 10:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf3b3480390b107516137758b843a660 SHA-1: c60b1e5eab199615183b5fb9be8eac901009471a SHA-256: 868013c83d4cbc09508d5da0a8f2fb97fb71811c650233916110523092109ee8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised websites and disposable hosting, likely intended to host phishing pages or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=4k+stogram+android PDF link annotation
    • https://anninhsieuthi.online/upload/files/diwub.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613020185bd93---55074029263.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/rumukekikagonab.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/zoxagibazovakujikukosego.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/78165759966.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/88686664813.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf2de6b6b---81699999342.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210910/file/19273549960.pdfIn PDF document text
    • http://araratmebel.ru/img/file/kuridadupuxep.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092001571773499.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a50c0cdeda---gokubabit.pdfIn PDF document text
    • http://aa-nusd.jp/47608571071.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/96677635765.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/60434276867.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jowebunufunepavanolu.pdfIn PDF document text
    • http://splogservice.ru/content/file/7673479741.pdfIn PDF document text
    • https://tl-systems.hu/files/files/11515067519.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/nonisirajixuwexexubal.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/29752406566.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/56656364241.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/58060187850.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fixirekudolez.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_02_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 16320 bytes
SHA-256: e59a6cc32d04a7cacf5e921f93d593b43628e7473256f987049ae3dc7b35c891
font_03_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10488 bytes
SHA-256: 9642778d7d19c675bfb10a4a1ce2d4f9194f468c7f47ae9fc1d0680224acf480
font_04_sfnt_off000128b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B0 23024 bytes
SHA-256: 415d60a93d2c97162158c2c38dd8c0d4f106a8e0379850ddf266c8f173158a91

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