Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b6777ead51bbbf…

MALICIOUS

PDF

75.9 KB Created: 2021-09-04 07:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1738cdaf9291b54201301db94cc13be SHA-1: 359f8cfdaf16105e7a2d39eb4dfac1d0c61b4622 SHA-256: b1b6777ead51bbbff6ed4e0a9013b11a5363970169c7281d60710e1988ba1858
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload directories, suggesting a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://woodwork.pl/ubezpiecz/obrazy/file/lotop.pdf In PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/liresepuk.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/xubikiboxanuleres.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1b1961c19e1b4f99b470b9901b164e4b/63607525756.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/fesejotexages.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210726_201422.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/27eeb778721708cd4041b87c85f1610f/ligun.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/da0bd246d9974ff7ca716856ac034ee1/39811554545.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/9091638287.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e01035c2940bcc0cb4be6b6e9826ea40/zagesafo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/92fb3e4e150a698b187bec7125fa684c/xodibujis.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/2980035127.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15e99c05f---43703826057.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089329a411c0---90745816999.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e587c036a27---dinijawafuganuzagap.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/novuwutulebo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161256ea8782fb---janatozebepub.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/pogupigekironuwibu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/67244780505.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f1adb877c7a502bdbca5403a7b774a6d/54967580072.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/53386429716.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/bonadatarogonejadebefaxuv.pdfIn PDF document text
    • http://wenxuezj.com/images/File/52372313035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=preposition+of+time+exercise+pdfPDF 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

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_off0000c604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 16872 bytes
SHA-256: 1a38241be20abdc1a65ec75eedc3bb0c8de663d4f4ae8588aca969db1131a358
font_02_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 10676 bytes
SHA-256: bfe47b005ffe475e0cb8a3971401a0b9e979d85b203de4a7758e0c22dd4260b0

Open this report in the interactive analyzer, or submit your own file for analysis.