Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e219eada7c0162…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 20:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51bdb1324c9b559956391de388c5efbf SHA-1: d8e3af2e53281e56d3179f8d16504ccf5a158b47 SHA-256: 10e219eada7c01627fe917f10a1dc52dd06b032f03bcb81fcb36c5025a6d83fb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607918bc2bb00---98774092298.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c45efb7b11b---59161495120.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e978360abf---8081984163.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d71b5890c---18031632050.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/merigivepubijiwokesaregir.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/46471320456.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f43704a9bdf---4790637197.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/damamojigatakozigukojuzun.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sovejezifijogeredagaz.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/76938062256.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e76fdabcff035ff4f1cc25cb5af5a3b6/70204957234.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/tiforene.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/rafaviwirokobejafif.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bdfa6ee61---fotovafidake.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab20809b5---lodabugimorik.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e48gn9ahfk7m19u32kd441oc35/23554698049.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/dowiwupavesanawi.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/90918613515.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/8osm4p6hm9hpgq1n0kivqvaq4p/kisawajenasafisupo.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/zixupofe.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/velikadupimibije.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d63b37e679---92944833905.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/jutuzepapow.pdfIn PDF document text
    • http://2440027.ru/upload/file/57699947923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=siemens+plc+s7+1200+pdfPDF 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_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 10720 bytes
SHA-256: 01f2eae73921d25c8a44fb18446f236ef1bc5ce30c8e4f67bc433498e6a49144
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 19876 bytes
SHA-256: 0cbd2991e855f9af216d6e5d6f1e5b544e795e094681e007836864af6d08d7c4

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