Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c67142daa6b2d17…

MALICIOUS

PDF

112.0 KB Created: 2021-08-11 17:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8cdf3734216ce9671af85b0213566bd9 SHA-1: 79f4361a5af5a865137176fa0de047d455093bac SHA-256: 7c67142daa6b2d171c7234a2244ecdd5660541a94e94490e653bd3f5ebbcb00b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. This suggests the document is designed as a link farm to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7516

Heuristics 6

  • 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
  • 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://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6dc96d12f---8399092451.pdf In PDF document text
    • http://www.cerathai.com/image/upload/File/notogemo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f2f5c4950---xozizak.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/durupibogosaramirul.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/99138993211.pdfIn PDF document text
    • http://www.siposferenc.hu/html/wowofaveritutexa.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/kubokojubelimofidom.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3ktgef566i6lumlnludp9212o7/26563770501.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/favapigexirefelaramozo.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210731_820C3F1763CD0918.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/ralipavesopusavojil.pdfIn PDF document text
    • http://goref.ru/files/file/35548479990.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/woveji.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/19644310123.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42c2e7487---20031460911.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nn2483klhb8q1g2vnfrr0lib0k/1792660108.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/mepunemabakolunapabora.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160704e7ba41b2---90687505450.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///sodujadiladalaruvowon.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec8b9d8cc---zutizo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da9d2325---falikolebowiko.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/7921637368.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094246a1a2bc---35386292757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+armor+tier+list+hypixel+skyblockPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/fetoduvaruzuvudur.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001887f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1887F 11268 bytes
SHA-256: 6013319f9c5229ff755e5e375b83f3982d73005ef574710a372040c2f08ad086