Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7387845e93883e…

MALICIOUS

PDF

97.8 KB Created: 2021-06-25 23:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3286396ce2d678a89741a0c3aa9938ef SHA-1: 2fb06e943232c90b857a84d0a4a7093eacc4716f SHA-256: 7e7387845e93883e22eb0d8971e65afdd352b77cb051e78f2cfa9a76048855af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and other disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://archism.ru/uplcv?utm_term=literature+review+of+solar+tracker+system PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/25f6564d607c43c09a783c342a16dedb/giviwinowebemidisu.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/50f7bcc73b161ff6b235963f5bd8a105/23231667417.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/6398077446.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0272e57d3d---wevenumar.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0re0o4dmrj3m62rkl6najaqviu/bojawukobonedoga.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bd7f695e2f69ab4841d4d4e13e02ab75/25997202711.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/99149964786.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fifimezorop.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/92ca978990f5ef5f8e8259afe620caff/15172174459.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xixaxanix.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d7ccf908343835e1df692020d39f4a88/98996197557.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/c93cafec21f94800981b86ce420e8fc8/livezeganizunasevawejoke.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ada161f2d---7598934563.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ca09b1227---45742817012.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/28e85a614fa65baf285aad66ebf1610b/jonasutipovirajudimo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88def07ab---4021130006.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e04cd8ed6c---30945449501.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/2598379383.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/eb87f65f39d9832586ea4a617cca5299/63039733187.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fikoxi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc31c043e3---88524039113.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/56860532156.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0mau8k0dtdseh9vqcvlmvumikb/51234963158.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/muniteru.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/48636524016.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
stream_003_off00010723.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10723 18460 bytes
SHA-256: ba555a3a9b01ab11c1c41e5b45c5fccbb44a22fd683ee2504f730668a5cde300
font_00_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 10808 bytes
SHA-256: 7b74a1f8ed7b470fb6043a1947d92cb53714f44a5632c21c8c009d420a5df694
font_03_sfnt_off00013e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E76 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_04_sfnt_off00014871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14871 19588 bytes
SHA-256: 0d848a076167fbd9352200611244dc423aac2a9ed5412e14829b147e9fad297d

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