Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f6db1277f09e18…

MALICIOUS

PDF

87.2 KB Created: 2021-09-22 17:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0189fd6b6df1ef102c4d2424bac5492 SHA-1: 9d618210dbe2254c9ecd92f8101d0d970955369f SHA-256: f7f6db1277f09e18e7c5f5f71e03398418e4146c0d77761669f3aedf29b3650e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating an attempt to redirect users to malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, supporting the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://flapboxes.custompackageboxes.com/userfiles/files/60773990843.pdf In PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/5288003835.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/45779913711.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/xevukexarumumuxasosi.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/wamekedimezaxasajir.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/65364348652.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c2bd781882be471d8a0cf37ee0c34e8f/befaromavojipekovo.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210918185113.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vukabadore.pdfIn PDF document text
    • http://co-mit.com/uploads/files/7872646615.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/sipatisonoxoli.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/19178482048.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/wezuwebixuzagusejuzinix.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/29978177922.pdfIn PDF document text
    • http://stylekd.ru/files/jugodenopigofa.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/pepemi.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/53823827335.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/25476234752.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/mejejivurodosapimirez.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2c6f9cfbfb3973cd09e035d012dacf0f/tuvogolexigejif.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/82866532675.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210910054226_xey6zj.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/88041283649.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130ca19be9---20185890865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=return+of+a+king+pdfPDF 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_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 10696 bytes
SHA-256: e9ecee1c781dcef70657ec274e7a42316ddce670514be1232a43d46ed1167f3f
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 20264 bytes
SHA-256: ae3eae99a013b485d3841fc9b8d9dc4e8ddacb7a5aa2696065c54e183e98e880
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1