Malicious PDF — malware analysis report

Static analysis result for SHA-256 c412ef07788ceccf…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 13:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcdca9d1c26a92c66a5c29542ddae48e SHA-1: 59d57c6b2397a800dd82e498466222871700b4c4 SHA-256: c412ef07788ceccfb57065015e1061c94d0e313563d66f2cb3a6226cb2ffa69e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=wonder+woman+tamil+dubbed+full+movie+download PDF link annotation
    • http://vwtint.com/userData/board/file/nilikewamorelimamiris.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89032791926.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/68012988125.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///24793784130.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/puzakujizip.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/98052415957.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/kilezuxerof.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/37480380587.pdfIn PDF document text
    • http://centrons.com/uploaded/file/9833963586131aad583c67.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/97002070485.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/kubusidimasaputedofev.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210907160002.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210910065355.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210901_D330EEAD3548A474.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/81674953690.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613832639e285---dagulobuxufukokiri.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/5276177096.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/30863850699.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bd24b70e752ba5d579666f45ccd1e16f/86387623200.pdfIn PDF document text
    • http://vhshf.de/File/52669975970.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd9745f65---70628957563.pdfIn PDF document text
    • http://bushurov.ru/images/files/66406453695.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/89726273790.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10732 bytes
SHA-256: 5932bcdc14dc8d778fd4ce55fd445b95e438b84b7695429ce07fda533b011f35
font_01_sfnt_off0000cd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD79 16144 bytes
SHA-256: 7d137f9488b54c227f6234e25e7318e742e782c9cdd952d1bedb3122825bcfc1
font_02_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1