Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bf4271c89ac0ce…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 09:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecf80cda98b619f1940c530d4c1861b0 SHA-1: 68eb5779b7801da51633c958f136c108920b29f5 SHA-256: 70bf4271c89ac0ce18806534757ca6684b642b8eaf51a7991f2d56bc32af37d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. The primary goal appears to be redirecting users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shopcloud.cloud//ckfinder/userfiles/files/kejaxijujaka.pdf In PDF document text
    • https://panificiopasticceriabattaglia.it/file/72808711111.pdfIn PDF document text
    • https://12waktu.com/contents//files/94490441553.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/90631819055.pdfIn PDF document text
    • http://e-hane.com/files/15276573088.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f73448c4---kopevajowejob.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8b82921b---89563013896.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mihnamtn9r0a5989do8tbauem1/7609787980.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/24772406078.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/nokegejizejetem.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/sovonuzevubobowutej.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/e205d2f40ddaf21bbc7384b882ea1fab/lusuzafadikanoru.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abf72454941---6985852297.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/66267438175.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/jeravufigo.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kopumusamefuxurabimupo.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/34879998967.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/17858334188.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/v08nr5peb0j7m3e0j7s6i8u4dr/lubozexemukuratafusan.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/fowokujibawe.pdfIn PDF document text
    • http://www.celso.org/download/31073637645.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/kejenuzojekagopapo.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/tiwom.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/22789f7687d7f4affc7448759d1bd591/69450851722.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab31a71b7c4---vabobixatowebonel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cancer+man+in+love+with+capricorn+womanPDF 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_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 17752 bytes
SHA-256: bf1e13e7dc4b8661318661ddec3c603c15b4466f7afc504dc75fc49ef0abab2f
font_01_sfnt_off00012925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12925 10652 bytes
SHA-256: 15be4dd83cda76afe4a566ca7b2d8906064bc2df593ab3b663e86566b925fe3f
font_02_sfnt_off0001415f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1