Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4c9626356dcca1…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 12:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff7c977ad9ccfbc56176d9866145783e SHA-1: 6958fdd281f86aefe6682bab3bba178fefdd5048 SHA-256: bb4c9626356dcca11ae6420788d89448bc198c96698b41c1e6f2bc29e960aa77
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7796

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.
  • 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 https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/c82a8be34fdcf231a66af0eb9874f998/49038856804.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358fd7561d1---37462368849.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/74879072792.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/raxefawipoburexoxi.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/99031658706.pdfIn PDF document text
    • https://regenerateacademy.com/file/41844301868.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/6sukeicvpi6aefep49fbm2fp7j/fudixizamudaxugesiwo.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///83298588263.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/78178072822.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/3925039657.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/nigofab.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/29616339362.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/39312059350.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/57308543634.pdfIn PDF document text
    • http://klemanpince.hu/files/file/fedawibufofagoj.pdfIn PDF document text
    • http://client.diffuse.info/files/joziwiregeguzowog.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/telogegozawijo.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/80370520955.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0djkccfec60t6aq2vjkikot2e3/40931084498.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210905184509.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/vowijoxadapefuviwuto.pdfIn PDF document text
    • http://skncn.com/u/files/vomom.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/31681785127.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jiginifub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=android+apple+tv+castPDF link annotation
    • 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_off0000d5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EA 17616 bytes
SHA-256: 850e2c9b7b3d4c94d0829d80b49f080b9c81cbefcaedb3aac590a5bd844e6103
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1