Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6a9383856397db…

MALICIOUS

PDF

89.4 KB Created: 2021-09-17 23:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c39dcb865f296e94db7857a8c3d689e SHA-1: 7c4e7e7fc315965f2bbd23547ae80844cee0992b SHA-256: da6a9383856397dbc0f7655e18eb811eb8574adb1ce348d58ac3ff227cbc75fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://dichvuhieuchuan.com/upload/files/16017756035.pdf In PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/13976268350.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bce008ac4---42297082991.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/91779514997.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/73911343052.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/41377062345.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/56714188240.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/93338639073.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/54171039972.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/biguxagaripowe.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/68160892887.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/mugajilodazigawujibewe.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/2931183777.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/wadorogijegodi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/zavafesilol.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d4223289---67072178668.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614460098a39a---wabaworizuwomoxubemalov.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/9987868856.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/89443398996.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/xazejarofafijeref.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/kaxejizetapedajasegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=baixar+whatsapp+gratis+para+samsung+androidPDF 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_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 11004 bytes
SHA-256: d80ada79a6fd9d54da16bdd065fd398c5adc2090076c7492aea0e9f3fb4071fa
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 18288 bytes
SHA-256: 4ea47f3284caac3bd36df7d904913e277b8825bc65b29efa445731abb31cfe2b