Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02a37c47ec86066…

MALICIOUS

PDF

150.7 KB Created: 2021-07-12 22:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3b1f500cf3c37b24a77ad7e80e9bbeeb SHA-1: 0d416e5fa369a232c9e45946524772466f229caf SHA-256: e02a37c47ec86066993ac687176929867ffdead73b232c5c01afb441ee9e29a3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on compromised WordPress sites, suggesting a link farm or distribution mechanism. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://archism.ru/uplcv?utm_term=heraclitus+out+of+every+hundred PDF link annotation
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd51d0d1a---mumonusax.pdfIn PDF document text
    • https://estoniapools.com/contents//files/23620932008.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/51622467145.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/ligolizesotef.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/89942434583.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6dojeba2efclajtffq112dr8iq/sozule.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d80053a2---8748122774.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/94a4e94d411aba5a0dd8d9ce93395faa/javamivopuxor.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/zidobumane.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275cca81a3.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///17111098170.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942f490627f---tomakidavi.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/74954525942.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78dfdeca5---48330407679.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d4ff5edd8bfe5bb498663b634c6cce8e/kimewinevokaza.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609409946011f---tituremukezivekasowolar.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5180438ea8ccf4d4fde0beeaa1dc51dd/lukaxadozagomutoda.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/pegud.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded50de3d81---20706828147.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021619141254290.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/9627703856.pdfIn PDF document text
    • https://ivaco.it/file/lotesogedugapogosagidiza.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/jexotorebaluse.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/gojuxitapoti.pdfIn PDF document text
    • http://clingac.com/d/files/jedofadogetoxixi.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_off0001dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC0E 10844 bytes
SHA-256: 422c9f09fa39bf26167f94385868b9a9fd1b060e6f69707bb99401743db9bc05
font_01_sfnt_off0001f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F501 26780 bytes
SHA-256: 434e34f617de9b1575bb74e7d575f8833c656eeaaf1fef75bd167011dca1330e
font_02_sfnt_off000234e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1