Malicious PDF — malware analysis report

Static analysis result for SHA-256 6136ef6cc1329b52…

MALICIOUS

PDF

105.2 KB Created: 2021-06-21 10:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 09fc854d34466f20a110054399010647 SHA-1: a7f031dea21505ac7147c000f9ad245dc82565ab SHA-256: 6136ef6cc1329b52525e4d6fa4cdcb23c0bfbf9d7a8704f741c6839d48bbcaed
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=hanuman+chalisa+mp3+download+bestwap PDF link annotation
    • http://polipadel.com/userfiles/file/49910061865.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/vadubakawizam.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a927025111---nuvid.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e0988d394281cc28f0bfd00bab4646de/moniwodusefepivav.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/9f687ffcdef5e5362c8e399ff7ca1c09/71238800575.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b035ec6f---fifufeliw.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/62652127115.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/73985837343.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d2892e8942b3ae647c430191838aaa72/suragupupobexe.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/53297743320.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c529acb3f---niwokimuxid.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/cukbligc15u5c1758c5eu1gs12/xomerezelu.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/zobidofeg.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/onf0veoe5mu19uov1nbvvv3htc/11196370937.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a907a98d6---demesabezixagazaporobife.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35741c75cb---revajadisajaneliwib.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbd14654921ac03c72d0a19ca7c3b845/dobebudoxitabenekigu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb435d068d---79255191540.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/pevakix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn 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_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 5456 bytes
SHA-256: f3b9341d8c77d16d12ba563fe7c3d4f3c27e78df5eb6b04fddf6c571d5a08fb3
font_01_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 12308 bytes
SHA-256: e14ef74d6725400a2af20e5027da651f1dc0e9f7273c5907cc9133ba0100a743
font_02_sfnt_off0001468f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468F 16132 bytes
SHA-256: 859921f1c7f5c3e429dd92e5907e2417d4f2043afbd4c2fffc8dbcd4c1380f86
font_03_sfnt_off00015b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B87 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_04_sfnt_off00016987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16987 15420 bytes
SHA-256: 75536e324d14f58a6a16bd274543976118304f79ac9f744bad43e535f237319b

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