Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ebb0bce3002f633…

MALICIOUS

PDF

86.9 KB Created: 2021-08-15 19:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1501429b4b17242cd08eaab6489773f6 SHA-1: 0f9788b847bcb2e21c58dea3af73565035be77da SHA-256: 1ebb0bce3002f633c7b22cb902492557031c2c7d2002db4e4ab4add67e67d453
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and other domains, likely to host or distribute malicious files. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e238f6a260---jojofexevanoki.pdf In PDF document text
    • http://jainfarms.com/uploads/25177783417.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/tojexelujesoxufutivuta.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114050fd903d---keximuzofaduriwexenam.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/motosujiki.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/m2964tjfrclnvu5l4022dmhkpi/23475474405.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f0686663---mugidiselifu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/h5khh41kruj7jk6v5rmn50tsnl/81932620952.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kasaxetomon.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/darmea72fbneq3jb5jd3h9fc3h/6720141335.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c652982a61348fe8f9534e154306b179/53074156285.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/550cba82f964ada8fce283811210e7e0/75589997380.pdfIn PDF document text
    • http://chinalabware.es/d/files/47190878183.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/texavawijuv.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed0cd25f9---62619045955.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076339ada481---60812762.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48382046040.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kivakozu.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/majogepidupizixuwakese.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/pubipezedavev.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64abbd1cc---1076766796.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b630e7d0f---85503288047.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5cbf413f---wokarovaropox.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/52185548273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+hunger+games+3+full+movie+in+hindi+download+filmyzillaPDF 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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 17392 bytes
SHA-256: e0699487893e184ad506bfb8acd84f8e522827879ca53d559a9999876ddcdf7e
font_01_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 11264 bytes
SHA-256: 238f825378196a2ca7801a738b175c0509a29796c992d6e35aa9a4dce4092f83
font_02_sfnt_off00013589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13589 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1