Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d28dfade6c3e4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 04:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f75b83fe4ee38e81179e39ea8589d27d SHA-1: 6e8fe388707193b0997f3a630694afc50080d177 SHA-256: 998d28dfade6c3e47e7c2605a8a716f81dd8c40d457f13c5e97fffa9d7095bbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://atenngo.com/admin/sites/site/documents/50796353792.pdf In PDF document text
    • http://apex-architect.ru/images/file/41352121108.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/womeza.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/cdf4889cb9dbd2cd5a15d120759157b1/1475591852.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/62152333850.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/soxokilawoxalugi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe21b27843---2663047259.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/hitsqlmru31ic814numvokt4eu/jofogogefaduboxopuxezipil.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/59897568042.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/60stpq64e8jumh0tkrd6p9ts9i/tofipezikegib.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a65e746fe---jibopunafufore.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/64341361494.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/ravisutaxuxudoduj.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/fajedojen.pdfIn PDF document text
    • http://vce34.ru/attachments/file/dozimeg.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202181054963211.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/336kjo8rokj4fr41o4mb7p1nv1/dikenorenulivotulogaj.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210719043121.pdfIn PDF document text
    • http://dd-eng.com/files/files/vutonovuniwogapig.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/84690586971.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/fj040id4na46n431dug03ajje0/zopafinaxirezusoregolij.pdfIn PDF document text
    • http://muszempilla.com/files/file/29948166980.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/lefemimolesew.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073102622d2f---9778808358.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/39161830410.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/3768512053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+to+word+free+apk+downloadPDF 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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 17524 bytes
SHA-256: 0738d5e9c97d43d7d7f298d4276dd073f09ea79aa03c75438b0f1531208dd06a
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 10408 bytes
SHA-256: fa71ca244cda438e9880e90306036135612e5d32e22d3bd925b1e94c2d5f7c54