Malicious PDF — malware analysis report

Static analysis result for SHA-256 210ba94d313b34dd…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 18:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 282409ce4afb65a3e9590ed09dac1ec7 SHA-1: 2a6fbfbc00894bc3e810aa28ff384277152de52c SHA-256: 210ba94d313b34dd5f6eb0bc51f6020faeabc88a7f73d54287a0f476ae713a31
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=how+to+transfer+file+to+pc+from+android PDF link annotation
    • http://domoticasociale.it/immaginiNewsletter/file/33853994108.pdfIn PDF document text
    • http://rjt1.org/upload/files/32153409745.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/bogufedomirilezip.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/41a3bba0ae722d1c1c72d32011d47017/bewugovutotigefudez.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/faponive.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/puborowumaxinuko.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/pupuluvovosekixiwov.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210913_C24FD5EEE0BAC98C.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/sebuvizavasexuvofajuf.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/89271779561.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/86025339718.pdfIn PDF document text
    • http://reflita.lt/uploads/files/faseguxatajolelukenew.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/57041919741.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471c149dd44---zidemaxudigubofokusipur.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210904_F75832C1FD37CFE1.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/58331753110.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/nogosaripa.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/3499959980.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/lj35ioqt1aps9k56446v34po5f/32853498835.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vugomasuniniwumobanixinof.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/tewase.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/43864600133.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sqevek39ovt6bn5i5cr1lqqv4s/fomigazuxo.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/15936701566.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/87566925552.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2674aaf5f6679e7089c74acc4c0810c0/72982086415.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/28724004776.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_off0000d3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 10860 bytes
SHA-256: 9d4193a35511c8dcd21d35c42fbc4ceff5d149b48e9c644f1ad58cf8ba81bae1
font_02_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 17320 bytes
SHA-256: adf94a2ab9d0670a8afb2a81f62e29d9cbb8e350d6addea2924133682c6788a4