Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd14152ba56adbf…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 17:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8f28344830639faac4974beddf69d0b SHA-1: 6138311fb127982aa1b87961040a7e8aaa9705d2 SHA-256: bdd14152ba56adbf85e60356bf7eb3e774902eab8daf06be2f143a90aac6674f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=descobrir+senha+wifi+ja+conectado+android PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5102e8218---60629663732.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/lunuf.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/60221666648.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14221918521.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/66344612660.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/13cb1a7742fb67833f3e4a09a3f19492/76829381308.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/92260453213.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/17423699686.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/1525733392.pdfIn PDF document text
    • https://kaisar168.com/contents/files/59152891869.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3dd4182ec---giloromananojik.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/36614023812.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2021127431683726ac111496abb706ac/49180903412.pdfIn PDF document text
    • http://jagamimpi.info/contents/files/31263787573.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/25659526377.pdfIn PDF document text
    • http://hangquangauto.com/files/87939173116.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/pikik.pdfIn PDF document text
    • http://nemochem.cn/upload/files/godagikigepafuwakobu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b7e98a5f0617be422288ee08c0f3059a/xexotizegusonuvabutiwusov.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigagewatanowewikeniz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161375a54a6563---88565421105.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/gaforanejitomagajuzo.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/24039751528.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_off0000bc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC77 17728 bytes
SHA-256: 6c85ac5a21fa121bc7d2e2952f262dd7d6a95d62941157dd5a71df7a6199e37e
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10884 bytes
SHA-256: c8e849f5281c24392fbbe66a2d1f8afd17149da0f7d8fccdf8c295228fca5ec7
font_02_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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