Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ceb2807f3ed54…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 03:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29b0d695ddc9c16d4b15fb7b340da222 SHA-1: 139f212932dd5fa32642ccb2d9f18125e9974881 SHA-256: 852ceb2807f3ed542d6f2655804da2f702a5ffdb08e3eac2e3f892cd8ca50d7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files, many hosted on compromised WordPress sites or disposable domains, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual content for analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cleartunemonitors.com/ckfinder/userfiles/files/38561879443.pdf In PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/pusutaniwapetopel.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zedaz.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/gusakitejunokipi.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/45664372966.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/26085905151.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/44392264409.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/dizij.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/32301464809.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/73dfcfaec0ba87e228e0e71f755c4113/xosagomilixozivuwowo.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161356bc0af275---4508585998.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e4899c912---deluf.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce50bd1a4d---jazofaxipesem.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/35830665849.pdfIn PDF document text
    • https://profm.hu/files/file/38122595617.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/fopitarojos.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/21766852653.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a9f4b2b1---39545866658.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/lutefifezejokelotumo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613082ec9702d---86766580791.pdfIn PDF document text
    • http://zamgph.com/uploads/file/112151551264.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/dakapemalekuvowajedomibep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mpeg4+on+androidPDF 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_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10324 bytes
SHA-256: 06ee5de46742098e2ec3c00e68888dea48aaa7d7b34706193e2a5ea125d21ee0
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 19600 bytes
SHA-256: d267046d1a1e0f25a7fcca301521f111f6b111ef531ef1ad486e86055eba76bb
font_02_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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