Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b320559c6eabf3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 00:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5196545fa4802fe0a273ae5d781532ea SHA-1: be29db0dccacc7f0ee45599f2b1c326882a08143 SHA-256: 19b320559c6eabf372315e831dbcba02d624f173290ce0b97c9bc169b5ffe61a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=teenage+mutant+ninja+turtles+for+android PDF link annotation
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/42181130088.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/guvuzalojisavoxevifoku.pdfIn PDF document text
    • https://festacontinua.it/public/file/21246174575.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/20486473284.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/22173155206.pdfIn PDF document text
    • http://hzqzg.com/d/files/5402744285.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210916065501.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/21457904017.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vilivulof.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/50005171356.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16143331dabfd6---76290547660.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161414a2845c2b---31565460189.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109140824457902.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/nemotezifaxavuf.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/bazetesonutexum.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/97475564185.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d4c8c61e009c088f0da874b845715286/kufugulifezuxafem.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/75833559232.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/46259819082.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/82658738581.pdfIn PDF document text
    • http://ergakiland.ru/files/files/xiduse.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/tezenekotebuvixamap.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_off0000c75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 17220 bytes
SHA-256: e978845c9f9285a72fecc3abc67d4a1031fc34807ded67744c195e249083205c
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 10892 bytes
SHA-256: c5f4842172398ba8a05b203272a0aa7ab1524f791b80ce4426d27549f12972a9