Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e2ebc31eb35be5…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 10:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1b2cabe85263ff7bcb0682a5dfe0b9fb SHA-1: 5f1c4b003ecf4c110b69a70ffa4adc94f5e4e2f9 SHA-256: 81e2ebc31eb35be500116e4fcf89f0c744ee7043db24c873edc99bd70698f3bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a 'download' button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fdae7ea04---22329913553.pdf In PDF document text
    • https://efnnma.org/files/file/kebujojenixesemanazezivu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c5c91baef097720659d45675eff947b7/mazidemesidugetutogamed.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/97789075300.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/nexixenotip.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/95821065667.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/zobogopedabufizam.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/fpquc8uebj20l8huks4ecknl92/gufoviwabutagusapifamo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a41ba57e32---gukalol.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a81b9ce615e---31083013982.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d847d09d00efddab79a616838bdb59c7/wevurumi.pdfIn PDF document text
    • http://sun-tes.ru/files/file/17704576698.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/63605875972.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/3472427408.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/88484249499.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/giduxetegalo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hed2a4eg9hc736s3bmq9imev11/lanadeguj.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/diderev.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/92575702075.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/wikutoduziduxijipusegowex.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/modedibixigaxoro.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/ketenewokubofizoxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=conditional+statements+english+worksheetPDF link annotation
    • 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_off0000dea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA2 18860 bytes
SHA-256: e40d6155381a5c78c844f2d8c930c257db44ebfaabc6ad2b440bebcd5b93584b
font_01_sfnt_off00010fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCF 10904 bytes
SHA-256: e41266f32c579b42d591cdcad68c054f3ace0373125f1b42f054f0ffe528a5ea
font_02_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1