Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a551aa8fb0604de…

MALICIOUS

PDF

95.1 KB Created: 2021-07-21 19:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c22b8520ce79d170f14592347f62d3e SHA-1: ba19280e5099e6e102df0e861caafaebcb26af78 SHA-256: 0a551aa8fb0604def64b7c898d074727e55f64491908071939758ebea46844e8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://wallawallahighschool1968.org/clients/75819/File/57351121661.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/af15667826c582a5146d36d1240d12b4/61250602573.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5eba7c1f3d5f781930396f578817db01/12308891390.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/tejovilerabisozunuput.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051113131773499.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/fdcab832a5f363163fd1311e4032d6b8/kuxaxidud.pdfIn PDF document text
    • https://premiumtrade.ro/ckfinder/userfiles/files/28379532107.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/voxes.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1622662312.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/kidijuzevebirixavowulefiv.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/90350480289.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0edad79a---batudugexuf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/db995c565259a480a464abafdfc77255/bosamemora.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d5f538f97---20832284439.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/86952229339.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5561c158a90a143493bc46ce35605042/59931427174.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a93d1e8ddc3---60115549095.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210524173752.pdfIn PDF document text
    • https://codecs.roimages/file/62871075961.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091b739854c2---16496314249.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/018a5c3d98d27299d9736a3fb3c4b776/talitagubijof.pdfIn PDF document text
    • https://service-panev.com/userfiles/30783153978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=cambodian+sour+fish+soupPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 10760 bytes
SHA-256: 3c685db197bfb097298d33f1dbda9206c13c7a937d2ba9f464cc47a23e84bd13
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 17820 bytes
SHA-256: b687f740efc35125e039a079e6e616c25a3b0ab028adaef813b969de74175b33
font_02_sfnt_off00013fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD3 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off000155de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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