Malicious PDF — malware analysis report

Static analysis result for SHA-256 8051a01fc50688bb…

MALICIOUS

PDF

116.4 KB Created: 2021-07-02 19:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4a769a6bf8aad5d2f41e9db1b80941b3 SHA-1: 0ffd5c33b1bffa8a3b41d9eb9fe54913bb01fec8 SHA-256: 8051a01fc50688bb1ff370feaf501f496e24f7a59d7828e3fdc3efbe31a6b5ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The primary goal appears to be directing users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://au-zlato.sk/upload/files/ziwakakegip.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9594ba1a---71597875302.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/fiverenazemubiwaz.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24971512f1---48692045133.pdfIn PDF document text
    • http://guowangcable.com/d/files/noburizikajewuvokuluso.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/44535045643.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e143d20f---47501874484.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a26cad23d6471c29301fbdcc8f5b949e/zeposiz.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/74311946306.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/3lqfkbsrscv65nm9vbg2cgtpql/mugiragowuxonufukuxoduro.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/31965695325.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/353a50ffb400b6863023de05f1f7993b/kenupedivegaw.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/wimaxagefegevitesezurat.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9448a6eaf3---gidalalujiwavonoteweseti.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/14687711150.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/46931456209.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77650f19c---dagiwezu.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/telexowizoxojav.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xuwadojuxerekalif.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a982542a973---ninenu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3dn7cbvgj4sec8gpb0q36ga0mn/17586559656.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/nafexusuwu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d0432234b80a4b33a1286d0c7f4257d4/buvamewaletatet.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/jimijotekifenurezalorin.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bbbd93f7a---mejusinago.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/580be6f1151c908985da2319c4dbe037/58608089886.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/94038417193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=use+awaiting+in+a+sentencePDF 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_off000165ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DBE 17400 bytes
SHA-256: 0dadbcaff1232dd1854008ef662888beaed469cc274404d428979af4afcaab17
font_02_sfnt_off0001ab65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB65 10232 bytes
SHA-256: e91668db6b12f885746d0d01239b0de00b92d40497489377575a9e9c8665041d