Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c00b3fd22f8dc57…

MALICIOUS

PDF

83.1 KB Created: 2021-10-06 04:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1f099f5e83f130351070e801211e1e59 SHA-1: cf209bd6421bf70d8641eb839cae95a8ae51b20e SHA-256: 8c00b3fd22f8dc570c925718a4f54731f93c5aa4a2806ff774a1c5b25914be5d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The file's structure and numerous external links align with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8f567d18---fatejizesimuva.pdf In PDF document text
    • http://anpo.vn/upload/files/tanideneko.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/3702842442.pdfIn PDF document text
    • http://grupophi.es/uploads/files/boxokuguwunopon.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a6f0e804---6342089586.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/sulemikor.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/62584938745.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/54731106113.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/60531166711.pdfIn PDF document text
    • http://birdwatching.sk/media/file/25027380504.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614299eef2adf---93444218653.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/51153532063.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/8209462afd0515f5a18799b8f71e4fc7/tigudaxenafe.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/32846789317.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/9902700251.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/19598675988.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/sufapawajezide.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/fagaresuwub.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/44424000114.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210923115829_jbudyu.pdfIn PDF document text
    • https://makenie.com/upload/files/14897124886.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/92506970515.pdfIn PDF document text
    • https://ibok.rcgw.pl/files/file/58634228789.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/gezotek.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/piganizenelif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grilled+shrimp+with+shellPDF 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_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 19460 bytes
SHA-256: 8935d4f545b1484a79e715847b944e90dd19296b07c7b43cdcd1d0b3dc396e96
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 10396 bytes
SHA-256: 4c23430892ec99b59de2ec2033e7bbad9487992a4efb01c8afb1b600356c73db