Malicious PDF — malware analysis report

Static analysis result for SHA-256 44940b11d158150a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 13:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51649c0205b7d4a48d550ae24b115b9f SHA-1: 7b2dc3567dad5f23e91e745f1d7f3843af602709 SHA-256: 44940b11d158150a690bfc4134742756ffc3740f2317d525ce169492c1134684
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://irlanc.ru/uplcv?utm_term=ftdx3000+service+manual PDF link annotation
    • http://bielwod.com/userfiles/file/54195753621.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/poxikesifinaf.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae13c189c55---wubaratunofubudiramaluk.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/7237592270.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/74190623115.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/7e9c843fbfd5b551bddff44609872508/60776887530.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/wawaxomabawevanu.pdfIn PDF document text
    • http://skupka23.ru/upload/m/16310765959.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/kifabe.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/51507591984.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/98812884867.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4389addca0---gumomuxero.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/43930711954.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/mijomulelewukumi.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/47690048755.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c995291a90bfb62f569003a2f03b4862/66818718293.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/zumotugawalabilolabuj.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ea609fda49d9fe11dc740bddd704f638/28911895787.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2b7cb8dc5---kabumibuga.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/nilizadosufome.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sanowagoxisorurof.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07fddb1063---89037382440.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_off0000b775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB775 14268 bytes
SHA-256: f616ec1395c9e92d40dc6a660436ec64d98614fd0807c88dc13172b7f62b0ecc
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10948 bytes
SHA-256: fc489538b26ae87ecc88e2e18a0fe02cb0e944d30af12eb9ceab0b5f4f2b8e82
font_02_sfnt_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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