Malicious PDF — malware analysis report

Static analysis result for SHA-256 3680a31add020dcc…

MALICIOUS

PDF

87.9 KB Created: 2021-09-14 11:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdf502990a27c265c403e5fc49b47ba3 SHA-1: a7b43f65dfbc64e7a94bab9a187627277253dc81 SHA-256: 3680a31add020dcc0688b2993a98e5c9c0acc7eefbdd80507b2eb191ac242271
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 9

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=transformar+pdf+a+epub PDF link annotation
    • http://actybrain-consult.com/Upload/files/67727735573.pdfIn PDF document text
    • http://zenithmetals.com/files/63466510694.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/xejabapededitixemew.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/27583866770.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/binaj.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/91440766536.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5a3860de---gerubegikimilovuwijawozat.pdfIn PDF document text
    • https://fong-cai.com/upload/files/18745900698.pdfIn PDF document text
    • http://schubert-hh.de/image/file/71409988597.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/26572023516.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/81324963470.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/16508799604.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/suwazateniwolegasidu.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/42619048687.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/96751897932.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/24414579015.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/wuwevutabamowokop.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0009e3c0668fddbe3facf4922f8b0002/90625968419.pdfIn PDF document text
    • https://venus-forever.com/image/files/38209024694.pdfIn PDF document text
    • http://dongphat.net/upload/files/letedomekuwebed.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/80922933893.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/famiguniralujaruxod.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137fba8b3e40---nuwuda.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/42900951946.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 17108 bytes
SHA-256: 1e1876ab0f82f3eddee866b75cbdd4ce50a1c52c4ef2568f0ef601363b0d9779
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBA 10624 bytes
SHA-256: 6d1b32fdbbb5883321081145e1bbb4e1ea183898dfd200d5cf17134ddb97e74f
font_03_sfnt_off000123bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BF 17724 bytes
SHA-256: f31851811380f682b2bde60f89ca5053f3ac67c100b88428fbe197757c9b87f5