Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ba0be7a036a715…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 12:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b42df4b3c5fde414fb449daca9075882 SHA-1: 9aa66f86bb974ddfb2144b6da0b3cdf2549dbbed SHA-256: 13ba0be7a036a715660982ffb0894646ed8b67c338ef6d9d85887129c5bff300
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a strong intent to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=medal+of+honor+android+apk PDF link annotation
    • https://llbyggodesign.se/UserFiles/files/jinagumuberi.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/80527142248.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/wejutevulizozelobuweni.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/92553396719.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/gafezulevegojoretejoxid.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/bikujo.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/dinesetizipopatelizosa.pdfIn PDF document text
    • http://abwessex.com/uploads/files/fazavazu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1213f274d7217006a087cb38ff5765d0/31748561617.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/8lk5gtjp54kd1eonqs16sejasc/40256819777.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b54cdaa7b821ec37f6d0b33f3cf9db53/79054266708.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/femewo.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/55333959478.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/31271891651.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/84351024893.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904221335743664.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/85679607256.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/razupedurip.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/gavoluforufujigukuvaruw.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d4bd18431f926751b96ed8a9617d94a0/53416490770.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/giruf.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/41024712179.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/29814674269.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_off0000c49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49C 18292 bytes
SHA-256: 6389df0b26c46334276786d96afff5a4f5287481ad285fb4361a6ef3b12840ab
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD4 10412 bytes
SHA-256: ab8eb7f62aefb12fc9fb349bfe4b37e538d42189a6a324e2ee942a22df14068a