Malicious PDF — malware analysis report

Static analysis result for SHA-256 2176c622a87f611f…

MALICIOUS

PDF

85.4 KB Created: 2021-06-29 07:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6d525b11bc9817c6d01e3e116359053 SHA-1: e17a3d161cc90c7e374d948582f39c86e9261813 SHA-256: 2176c622a87f611f93a8cf0ba603a57315f22f0fde838d851409b43f96ebc890
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://badischer-kunstverein.de/ckfinder/userfiles/files/fejelutuginudat.pdf
    • https://powermailer.in/userfiles/file/15555892644.pdf
    • http://vhshf.de/File/69258189360.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701b7b70f19---61091797282.pdf
    • http://hanleyresources.com/images/vugeger.pdf
    • https://birotex.rs/images/files/pojixizoje.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094888e32f8a---duzuxutuxibabirisone.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210626131019196.pdf
    • https://uleshuzataruhaz.hu/files/file/pegulijajuruz.pdf
    • http://lukasikgroup.pl/Image/files/63371206974.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf06460659---14320749216.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607054019350c---17418998280.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d6904f007c0da2089e3bb2584d68a436/gawopi.pdf
    • https://ceccargiurgiu.ro/userfiles/file/82981171242.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/o7sfuqn6hcvti9l6si2ed294k1/nokemuraxufim.pdf
    • https://vestol.bg/files/file/5408864439.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d1e444af---98482533964.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0e75afcafe4ccb838cd6b549b53e7048/gopano.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a7bd2c6d7---zebuwepodolenujukumad.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c00de23130dd471cf56e6665860875ea/21302272810.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83f0a1a9a---77781518848.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/j2k285jufsff2ka78lq2t078so/lorukas.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070323ade7d8---fonukigemumo.pdf
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/9ub1lsolv6k0183hiqstlcfvrf/73237504766.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=causes+prevention+and+repair+of+cracks+in+building+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 16792 bytes
font_01_sfnt_off000102ff.bin
87487f71aa6d22ec8c0d5b20ba84c36e7f9ad6a4b120be30933e2bf6f247283e
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 11224 bytes
font_02_sfnt_off00011d0c.bin
76394b760ae7400056988b4c141eae773220204746f823c261b7a68e1756ac9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16556 bytes