Malicious PDF — malware analysis report

Static analysis result for SHA-256 014e3d7de1dd807d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-08 11:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18a171eb4a6ae207b1fb6476076c857f SHA-1: 56406babeafe271cec3e81817f1e26ae44807a19 SHA-256: 014e3d7de1dd807d50497e0efb33f5c469511840e384f5c11fa0a28a150292c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure points towards an attempt to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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=subjective+pronouns+exercises+pdf PDF link annotation
    • http://peaceinsrilanka.lk/userfiles/file/61419255750.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/dodevagabazom.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/129270780260be17ec6ce55.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/7c676782b8ceee34bf9bdd4ec1009dde/78000506338.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/18389895612.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/43984779803.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ldng9dmm9kgni81gngo4s046pa/rupepotasiwefowu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0c31b0f69e98b41357137582fbfd5194/wizawovaxi.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/widedudo.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/67922819058.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kanekejosuja.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/nowadorozadevosim.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/duwupapaseg.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c910b04a16---97788640888.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/betojefebipuluveboz.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb8ce2e3a---sujukozilemujuso.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/dagatukavim.pdfIn PDF document text
    • http://faradbox.pl/files/file/32283583432.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/gevevewofafujuje.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/18173126853.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/50829467456.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/pataz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0e97e48bb6fc979f6388d4fe36fbb5c8/34750368522.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/53500069724.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/58c7bd4b5db5d9e733971bd7771f3b16/84769117482.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/dd0bc63f923acbd17f8677b68d738a64/58288795070.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_off0000bf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2C 11016 bytes
SHA-256: 9f880680d18ccd148949daf84d5b875976a64eca1fa38d6571f776e6c19b2c91
font_01_sfnt_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 16928 bytes
SHA-256: 5b527c78f2344bf02dc30df2c0a0b815be3a6853d1f15cc20a29ade3d838750f
font_02_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1