Malicious PDF — malware analysis report

Static analysis result for SHA-256 0100765061bd8cbd…

MALICIOUS

PDF

86.1 KB Created: 2021-07-21 14:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d67b100c5c01dcfb0d372079965abbb5 SHA-1: 06a0dcede0b8b6f0a6749ed8e7061902ef721823 SHA-256: 0100765061bd8cbdf95551ee05cce6bd7e8c9791c4c2fe853e2b11f59277ff64
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF acts as a link farm, directing users to various external URLs, some hosted on compromised CMS platforms. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/tavarupedoluvoj.pdf In PDF document text
    • https://inncredel.com/uploads/85493535146.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/11590839977.pdfIn PDF document text
    • http://novichiha.ru/pic/file/40951251675.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/48pcrunn6un3gjek2kttre4ret/63074474664.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/64692614190.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/nolerebez.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/telugegibuvitevik.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5902e68632---mapuvuloveda.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7cc5p4q3hqa3o3eimecf7pe4b7/xuvavegosawokix.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/zerudagade.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/0bad9bde963fdf998a721820ed471bde/4176428833.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/sakilofa.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/begowiwomedolikosunegup.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c68fe3b9fd2---29604591377.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eb68cf3cb---zanofagivupirofupokegekil.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55c5b2476---zepofinub.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/pidesibu.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/56791038324.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/lakamiwowovizuf.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/wuzitenamokiref.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/tagilem.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/jhrsf307ot3k6q2pkot1sit8lt/1159071915.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b39277a26cf---rokosorawolojuzaromik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dial+1+800PDF 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_off0000ee56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE56 18064 bytes
SHA-256: c2fb21194de3568a8474b65d010cf5425a272f582728f085c29a2bf831402c5a
font_01_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 9760 bytes
SHA-256: dd817043a5b0367251b51bb806f88a14134a8b8d0088492c6c1bfb43a922e911
font_02_sfnt_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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