Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7e06d5a459df41…

MALICIOUS

PDF

89.3 KB Created: 2021-07-06 18:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29e0c33a571ce7f4ed466bb4b898168d SHA-1: aaa83d60232219f66db2448f1fc8ab382342be8b SHA-256: 4e7e06d5a459df4186dbf6c2caa056d9dfabc6474fcee95a5cc8a95916fe16e5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to websites utilizing compromised CMS upload functionalities, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, but the presence of a link farm on potentially compromised sites is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160917da7c2678---renomamarawagusiguwelagi.pdf In PDF document text
    • https://cowichanseniors.ca/userfiles/file/lilovekezeloloxonewujegu.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/60f3ca596f8fc783eeb111a028604198/98300559574.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8a6e4a19---54886691968.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/beritajuterupewoviv.pdfIn PDF document text
    • https://afayl.com/userfiles/file/xanutivavo.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/97512255258.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-18/20210618045532718463.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608773d7b4ae0---xedemepoxepis.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/xinon.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/62276542259.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/81443515879.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160852684dd0e8---83859319678.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/n9t4urd2uonuas1n6p4uo9q8h7/nudofamalapomiv.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/falarovivej.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/67367669536.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd61da80968---mokuw.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17083741f8---3080848760.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9otbfkml16n3bds2tnd3g7nvu2/84663903194.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/pojikij.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15013c98e---96846481380.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/suwodafova.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/52993422358.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a33174c5---wunibukopekimimalimiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=god+is+holy+according+to+which+passage+of+scripturePDF 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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 16416 bytes
SHA-256: 2800b9f3c944640a0044bf1482aeb09c22a5df8b569e9bf0e758f64e4c072354
font_01_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 11236 bytes
SHA-256: 1f15ad230475b4200e15dfff0017c2b565c43b6f708f1a72365130b8500c1ec1
font_02_sfnt_off00013f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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