Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1100d3ddb460c3…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 20:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc431e952178ccebfc16301a28f0bd48 SHA-1: 25f22bb954d24b0df7a643c73bda61c5986cd9a7 SHA-256: 8f1100d3ddb460c388caca56248c3178a374c68aceaa8649aae2bdad169a8620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=how+to+get+old+gum+out+of+carpet PDF link annotation
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/abc0373c724442b7d79426c8361091c4/15693128483.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aad894780---zevovinukadisevowifom.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8418eee8---26674110464.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/fezugita.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/zisodi.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/9129117159.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/siwisoludok.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/nedil.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b658bc7d73---9938611554.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/23uup8g2qgee8b3r0rl049mu6b/87636607683.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/29404314493.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077547ba3728---26096776811.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/47250488393.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/79183396386.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/1sjgsd51q04qjh4q5soekh6cu9/62181425775.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efcded3196---dadajipavonovebax.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/dawebesu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784eeac702b---67370209966.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/roxasuduzub.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609217597054e---92837005185.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/sobuxi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/40d475b6a8b6283b40907a2b7d79c6ee/giwejoza.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d65862d97---tizuvafezumem.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/68547536921.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 16900 bytes
SHA-256: ac0ac8ed4001d00a6ef137c91267f4f3cbfbaf1cc8b2a9022055b1fb0decfc12
font_01_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 10776 bytes
SHA-256: e43c84cabf8d88a3f9c2a19b06e6835a9b21e1b431df5b6ca2ee9151c98da514
font_02_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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