Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56802f50e8aa2e8…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 07:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4007c0e1a05182461571ed6d1d7f3027 SHA-1: 172c68b1bb70150292a73d416df721d733293951 SHA-256: c56802f50e8aa2e8ea6fc1e23571be9fb10921b3a7d0d409d028c86339dde43a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS platforms, forming a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple compromised upload URLs suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://gps-tw.com/CKEdit/upload/files/lunupezipotomuvefavusi.pdf In PDF document text
    • http://onlinevay.com/upload/files/guwigobotaridabude.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/10187c6ee7f31160c3a3a64f79546cac/77385170765.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/berawevakeromeruw.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951708bc11c---91113926909.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6c4gtoi1pusgo50q34231o7dju/42221567089.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/07f2d7faed593d28d1a241fd73051114/kulixop.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/debipipemurifuxego.pdfIn PDF document text
    • http://iphysiology.ru/upload/88013390105.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/binegokezaranevuxinukow.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0122dcfba1---50497225641.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/samivamafumu.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/lozusodogonu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54251a7c3---55686475686.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/70394783749.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e8c7a7ac---wejemo.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/bitologilonujenireda.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd90c6a86a---55928180515.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/wuvikizeteropiga.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/7974173760e50ecea83f7.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f82ce2e48beaafc7183d7f65c470fe1e/99327471661.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc3ece8ff---48308229677.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783253676fa---18517719890.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d84eec163a7---63908359008.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/ziweduvibix.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba39473df7c---xenukenapezerumamerejub.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/pojefob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+disaster+artist+book+pdf+downloadPDF 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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 10876 bytes
SHA-256: da150aa5597c6c50f623a61a36fd38fb1a16ab699cb86e358f22d9c37dbb682b
font_01_sfnt_off0000d164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 14808 bytes
SHA-256: ebefac03b967a21df2241f49d758d7dc82c3b1a5d957312ec731d6321dd520cf