Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87c299819f4e2b4…

MALICIOUS

PDF

150.5 KB Created: 2021-06-26 01:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbbe9866b9e8e7ea520f02d5094a9463 SHA-1: 19ccfcfb03d8028ea2e655260ad82912ecd1f1a3 SHA-256: a87c299819f4e2b4e9cf52e90e1db8f3274ad8ad1c26e7261d4cc4606b4a19f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of directing users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8598

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://catamma.ru/uplcv?utm_term=all+i+need+is+you+mariah+carey PDF link annotation
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f06bc300ad76ff3403035d4fad57553f/semipajilikilijekixiwot.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/56749548564.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c603be2f387---94384894982.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e728ce538f---givemevoru.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/penofifolegoji.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/r70i7k4fivl6f93otj8kd4ksd1/legumotedotirujuz.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/tudotuxonobulewanisut.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4c0724b0e---niduvemelinezedebofor.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/75721459380.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607055068c3a1---takata.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb091ba5b0---79446703337.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/revajefuguzorogaronebo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///71643385867.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cba16255d37---dazunatujodazexetifex.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160813309ebce2---32258598977.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58983b2c33---95844749198.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/74711208273.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb631bc159---xaraxapekot.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcd7beaa6---sukekukom.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/9511028537.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/51645350182.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/4nlotrncv0cf3m5mf1b511d628/68527631970.pdfIn PDF document text
    • http://thaide.org/userfiles/file/mozugakad.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e269abe36401834421d1741c93f17135/275928297.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/7198dc6in33evutr4ecsmrl9ql/6188391300.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/21500377418.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/gvusp9ttsao9bm4kv8m6274jlo/rogozitezupivomigaguji.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 10732 bytes
SHA-256: e8d64e8254d2e293dcf1d2892ed9537501186224dc54f93172e2d1b63d240f7b
font_02_sfnt_off00013733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13733 18200 bytes
SHA-256: 82cc84ca7bb239bc178a6f8d7bae7a01eecd0a5727914cd26fb5d0774bf84d30
font_03_sfnt_off00016733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16733 81428 bytes
SHA-256: 65515a251e654e085d87c164fb43ef9e023bd052d7729ce86bdcc18da908749c
font_04_sfnt_off0002334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2334A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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