Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e230db8b90daa8…

MALICIOUS

PDF

130.5 KB Created: 2021-08-14 23:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 24e9c70789d3312d61069d95c699285d SHA-1: 8008383b1be8c034ebcf0d7ec0805776d15c350a SHA-256: c1e230db8b90daa82d50986020bbc515ca13c6373fcb4538c1cb3f3e8fa21eb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

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://irlanc.ru/uplcv?utm_term=nba+2k21+next+gen+best+center+jumpshot PDF link annotation
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/e991ff265049dbee2bdee6992afc3d3a/xawelijegebonotajanim.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/69000311790.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/bc2fcacd036a2a2812987f3390759732/jelejokexuzeragokewiver.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610a895092af0---46329346663.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b9594e28cf4c176d35f46ad360793c54/36286536495.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0e0fa6ab579429a2f7dcc68e2fbda9cf/88589015792.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160946088a8c04---vidobomigevasukamib.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8331534c768c728fbbe32164525c919c/gafesarag.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/88739178519.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tajimefezowepedu.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p083jq0273vvc1r06d15shhi00/82249664826.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/60be5bb2b2bd5f8f84f98729b7da11da/jurer.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/ziwirizonusidekowumenor.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ttf58vg631qghhc7povqrigvt8/xesub.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/99326473831.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/47272999439.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/64039772389.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/34967472339.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608cff87eccf5---sonivagu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3e0a1450---nedokuluwokujawokegof.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/60ca297afee5a2fcf152ab1b338b45bd/fizumaxudujuzaxopolaxi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/aaefgcj3sff7jknoppatnft4b0/64918504174.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/wiregaloseluvekapanibiwe.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///jupezuni.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_006_off0001724c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1724C 18076 bytes
SHA-256: 78e6c3a7ea058df58960928d213b9fd957161aca195e5eb02690febf5d3855d3
font_00_sfnt_off000164a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A8 3424 bytes
SHA-256: 1ed1788b7873b7e20659814cffb0913d6a8f59d96dba95b4f2579dfec4ae118c
font_02_sfnt_off00018f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F17 20472 bytes
SHA-256: 4d29483a1d270db341054a0d5052aeccf240d9285fc9424ba7ebcba3521e294e
font_03_sfnt_off0001c583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C583 11396 bytes
SHA-256: 7c61327df832f359f6452dcc922d99dc17d45fe0599cc4878bd9268251ba25cf
font_04_sfnt_off0001e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1