Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa1ff94529dc228…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 20:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02c2a63d84161053e6b3479c6a8501b8 SHA-1: 418a253dff99e482e5c595e85da6b7ec69c940a5 SHA-256: daa1ff94529dc2289ef3de6063992b951353e7a0a1402f2570c87dc5592f07a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, hosting numerous links to PDFs on compromised or disposable domains, likely to obscure the ultimate destination and evade detection. The presence of external URIs and a link farm structure strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://turismo-galicia.es/ckfinder/userfiles/files/62203604496.pdf In PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/43372884296.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/a2c2rejepcvjgtor8rkmk92ta5/28939907146.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/0dd4c21e5666646d75b8f936c562e20d/54669246457.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/66114489511.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/sopuvadabojisazirisile.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/giwotegamudawevetak.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/66858152357.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/vedomubapebirow.pdfIn PDF document text
    • https://brukspec.pl/upload/file/79197855181.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/fejonirurigumitev.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/72301cdbd40bab7a902ed1ed7a495d6f/58580006722.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/tunilizofowos.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/tirukusugizotimemagoz.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/pigagopud.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/sumunudajepulorof.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/45721588803.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614575312b695---76345660516.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/83062366882.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b1c5882c---takujebezarumama.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902065945.pdfIn PDF document text
    • https://linardi.ru/files/file/42823277273.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/vinun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=current+play+music+get+paidPDF 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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 18052 bytes
SHA-256: 9e162eb97eeef1dbcc6e1dd6e2bea50614c4fbcf3f40b9bbb290a7bdcfd82783
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 10984 bytes
SHA-256: 4d59f1a29779b2f2fae8cbe4b9289e2df3863cdb6d88ea54c31f449c7fe3d83a
font_02_sfnt_off00012186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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