Malicious PDF — malware analysis report

Static analysis result for SHA-256 847c63e66b48a644…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 08:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f87792f7c5e16045688db543048132d4 SHA-1: cc8e52ec2b9f341d13e902be67d5b9a88f082308 SHA-256: 847c63e66b48a644bddb9abbd4641743012836c687a7ec88dc20910098d7c4ef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to download further malicious content. The document's structure and embedded URLs suggest a callback phishing or tech-support scam, aiming to trick users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=sucre+fermentescible+pdf PDF link annotation
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/90413945438.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/05201f57a55d77b85c6893930a1d8646/38832063389.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/78887559976.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d7c319ec3e44695daa3e3d0b9504765b/xowimelepadinuno.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0v8skvv352ij0psl8mbs94hfg0/68223597705.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f957d3287---95016331054.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/nevedudonedewewefusivedun.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8aa6a437e---56856902968.pdfIn PDF document text
    • https://spacio.hk/attachment/file/20492407184.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bc7890761715ca4af57d440814788cd3/wixiponanomoripix.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/jevozerozipepupi.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/kalonejokoduwedofatodu.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210528145834.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/14fac9a38619f4cf5df7cc57710d24ff/26312260942.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e1f3b27d91707d751b8b920f0ef7e7e9/62959535916.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a32b948a63a---gixokunoralujilinesetobon.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612460a98f64b---93485648444.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28679e6d4---bemipunupubatoko.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa6e38683---ninikisowiduxo.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/3325417803.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947b9a8d32e---talibisinekolugi.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/65270550861.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/46n3n3qdmd763065nap9tmbl36/12254723314.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/lakiruxuburevijuwawos.pdfIn PDF document text
    • 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_off0000c125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC125 10812 bytes
SHA-256: 60b59e310cb4a8750dd1a2a1b641d789d252fd902f80d7e7c2d496c13c2fc50f
font_01_sfnt_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 18512 bytes
SHA-256: b5695a027e94d195ccc13369f9fe38f7709d1c238d1d83c924bbc210bec21acd
font_02_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1