Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1ed99208a1c326…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 01:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e82ba17e608109d15903975e212247c1 SHA-1: ad7599dd1c5b9d5c5ca1d8a9e12f8dd61c06e7b6 SHA-256: 8b1ed99208a1c32637c1b6f326649d7b92091e58d85e976313d3dd47d2a914be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting. This indicates a likely phishing or malware distribution attempt, where the embedded script and link farm are used to redirect the user to a malicious site. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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://crysiq.ru/uplcv?utm_term=action+verbs+of+bloom%27s+taxonomy PDF link annotation
    • http://ranjitabiswas.com/userfiles/files/32911530113.pdfIn PDF document text
    • https://remini.hu/userfiles/file/30877330065.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613421db73b86---76930258209.pdfIn PDF document text
    • http://agronlogistics.com/userfiles/files/zujawin.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uv94pauhf37grn9m8fuhvg5ag7/25167754266.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/nijexemekizurirulojurera.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/godotezotojusanot.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/59818842054.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/487103027.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/32440571069.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/jidirexeredanobusi.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/70793685748.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e3325ef67---30350473969.pdfIn PDF document text
    • https://motecx.com/images/file/11823287578.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/92737774391.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/budilolupuwu.pdfIn PDF document text
    • http://netflor.pl/upload/File/sitowateridesatitilim.pdfIn PDF document text
    • http://fohow77.ru/upload/file/69032527356.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/fopopiniwijulukukozeboza.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913114527592639.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/74503504419.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/34321626753.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/3293586301.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/jewobod.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_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 10936 bytes
SHA-256: b1940a24cb9f12ca615d9b83d53354140b68ae22003db6678ba68abd6add0ccb
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 18252 bytes
SHA-256: 8a3fd00137233ea182cd6693e944d3a4a6025c60214e27b14d2d2643283b548b
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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