Malicious PDF — malware analysis report

Static analysis result for SHA-256 555dff02aa6fde07…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 08:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab2de6fc05d765c8a5caec3f7741f613 SHA-1: 509183903d72c3f8de3aae646b12c235c14dce05 SHA-256: 555dff02aa6fde07a228edc8315f248c07124721f045ddb1adf385935e057700
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and flagged by an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 http://automozg.by/upload/editor/files/32069637552.pdf In PDF document text
    • http://rasmesafar.net/basefile/basefiles/98141527408.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/8135374569.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/33589820599.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ca68e070---manupovopulubosajofixos.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vebumama.pdfIn PDF document text
    • http://ipceurope.be/assets/file/gegipisukezonesadap.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/38111609881.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/70526472105.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/43234673853.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109021120525386.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/lasikipologawelu.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/nexabeseva.pdfIn PDF document text
    • http://askort.pl/Upload/file/gepajosejomazajatexokumi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a546agi1015a6tg1tbt5nu4sc2/31136617940.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/woliwimimiwipudivuxoretu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f694e62e7---13775058900.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8a770e63---dewenizonesinukosiwu.pdfIn PDF document text
    • http://ranch.pl/files/file/82744211126.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090418103068.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/jagunidu.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/jumaxosafudafekatosomefe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613116283d1e4---46434329584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=banner+maker+photo+and+text+pro+apkPDF 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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 19376 bytes
SHA-256: a8ee7d64ba3a05b92f577b2250fadf6b4e8076018ee0bd5feae1be6e396bbbc5
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10596 bytes
SHA-256: 5845edde21a77c6a7d88fb2b7ea80c068ff432142f42ac6a803cfde8add9072e
font_02_sfnt_off00013593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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