Malicious PDF — malware analysis report

Static analysis result for SHA-256 4170828a247fbf43…

MALICIOUS

PDF

87.4 KB Created: 2021-07-03 06:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 1d6d2819ccd4ac52a3916f3e344af386 SHA-1: aa752ce47020397a1f95f4db279529ef0c01ed96 SHA-256: 4170828a247fbf4367d725d8e5c5d23c54741024943bd53700be38a4b7dee545
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. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=all+the+prophets+in+the+bible PDF link annotation
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3p6c1f2onsrdr05mk9gh4vhf58/94583571052.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/sexedefipaxer.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/8d3028975102d24d7a81a82910ab803a/dajejixojex.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd851c95b---77521003833.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bd899a43e---56724775236.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/verowawososoviwal.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/93276760979.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d47793466397f4e109669968f94b7538/92812658453.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/rivukumavulilepobedi.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/gonodeduxaru.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77629ddf6---fevele.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1218305330---fimisap.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7532487984---28808777545.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/jajipurilavokuloli.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/54049234556.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/22069364546.pdfIn PDF document text
    • http://orrizon.ru/images/file/2513520078.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a77db0b49a1f07fd479d6bfe964d88ce/81269721666.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/28847716273.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/eb09ac5290b1681aa97ab811e79dfdfd/najelujogigatajosebe.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/zemenomuvi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d24182c2e5---6561356975.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 17572 bytes
SHA-256: d26108447ec3490dbd12d212b860317425156329dd511e8688c2b20e8fd4e6e6
font_02_sfnt_off0001397e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397E 10308 bytes
SHA-256: ea44a940adf0666e7d0b327f851fe734b8d62b4d6cc1e1d3f903fd500e05602c

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