Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8a5d3a17f5abc7…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 05:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8da75743d493fbe8dd5d80b949199aaf SHA-1: cd21afa5e3147dc089e54ad97f102dd8ac6e164d SHA-256: 5f8a5d3a17f5abc7677293c0337fd5d994db1b0153ae89c48a170500434472eb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=where+can+i+watch+ullu+webseries+for+free PDF link annotation
    • http://swatimishra.in/uploaded_files/userfiles/files/1205909563.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16313477128686.pdfIn PDF document text
    • http://z500.si/files/zawenidozuxurus.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/92787211950.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3b64f197bcf3ea27b5ab6b46af7b0be4/48663689057.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/35060965161.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/62355348787.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/mefip.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/zexisuguramumejevoben.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/15529734467.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/gotawara.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/52b414f6aca5ebfa35f29e470d7f4287/sivuka.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/1218859177.pdfPDF link annotation
    • http://vsrru.ru/userfiles/file/19791838922.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/48407643604.pdfIn PDF document text
    • http://rc-modeller.se/images/file///14017983168.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a19f29528---galuxuzu.pdfIn PDF document text
    • https://hinaweb.com/upload/file/dakabirajukowifutow.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08ecd7779---futudazefezowinoj.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/79372405691.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tasololimukaj.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///51283378602.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_off0000bf07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 10752 bytes
SHA-256: 9b378436d9002d4bfd901321a97220ba4956fdf97dff91fd9ba65b66645381a7
font_02_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 17468 bytes
SHA-256: 081d48a08b8bfd0e1582279ed6da3eeeeb8b2d5314e0b78490a9a89f0767b57b

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