Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8429dd91032fd1…

MALICIOUS

PDF

86.0 KB Created: 2021-07-14 08:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 996ba7f7c1af2259c0cbc91c7a550550 SHA-1: b2a9b19441d99fb2533172d5e599ff01a179b2a6 SHA-256: ae8429dd91032fd133f6a8cfa9d5856af463dc35f60d76a6bf3a6fd6ea9b22db
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points to a link farm strategy to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1539900c9c65680422e9bc49d3d3ae19/29470198726.pdf In PDF document text
    • https://wickedcheesy.com/images/file/72678658669.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/28105048474.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fc7a89156368af3ebf6a37044705bf2f/witopewiripixiguligatuxi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce78612026---6949497982.pdfPDF link annotation
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edc387d653f---wodineteto.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626121281182819059.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a751229fb1797c010ab6a930b7c814cd/zidagopofonarejapezoja.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1547d4f0f7---41913748791.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/mejojobisogel.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/848388eee30daa4da7f7c5b057d9052f/jugewipimi.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/fcb20eefd73e93e53c9e58a0dac5085c/sebanarexejojulogobeb.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/gator.pdfIn PDF document text
    • http://alkanboya.com/files/file///tizil.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b43f0a2e---66563668903.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/31053354609.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/kuwutejerobifefexat.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c9898e030a9779b19cc26490d1368987/86733301119.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/342bb1f9b882c745f7b362da1e9136dd/82193434377.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/62602951562.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beedddc9904---bofunafego.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/33f3198718856aefb82bcf7322b77beb/mosorele.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/damesigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=orthopedic+imaging+a+practical+approach+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 18024 bytes
SHA-256: a41135984e12c0b449f37c2ad5791025ffaab26a273fb4f5b83638aaba47a1cc
font_01_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 10924 bytes
SHA-256: 33a737eb6fca7bf2da4d14a3e8a7787adc2c3fb4b98afc8846cd28046bc724d3
font_02_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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