Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20c277021d85c09…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 09:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 715eeaaacfd4e82c8b447b31406f80b2 SHA-1: 606d6eeaa4caf843884ef452ed51c230e85dabb9 SHA-256: b20c277021d85c09a162e0684a6469ac0bbe03911603ef88d6d8a8eb91d77d5a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be to lure users to these sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://footballsod.com/images/ck-uploads/files/31716206699.pdf In PDF document text
    • http://christopherspubandgrille.com/userfiles/files/xidadoparo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/acc81ef21d5e828e54666eaa74d25839/fewevibosotakexaxibexe.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bifadivivoreniwokevax.pdfIn PDF document text
    • https://susta.vn/userfiles/file/9695748106.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/fisilukafesenuresi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/47dd6237b1346706279bdead9f05fc7f/77940898326.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7vqtbdev6ccocnfs5j056qq7p3/65258624010.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/cc5292f75dd014c7657f6ca461a320b2/lotufusis.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501185410198408.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/17656793318.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/957821863583afcd65d311025605ae2d/22655562198.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732eaa9c5c8---miwelitowosi.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/km8dojt2q3og7qju47vr95ours/17615730205.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b0da35ff0365dd455db5da556d0ceb38/suriv.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/32889814934.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/walis.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a8354609---zubukatobikilegeren.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/85310233820.pdfIn PDF document text
    • https://actorconseil.com/files/file/kixamawomovajek.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/287c65bde75a7099d8526a4e432b2be9/somasoko.pdfIn PDF document text
    • http://bichvan.vn/upload/files/getupesamuwawulekarutosa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa68aba81b---pavakovakovewuroloxu.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/77067989348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+tale+of+the+3+brothersPDF 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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 17532 bytes
SHA-256: bf8af6b538a227ec880984a955a0ada40e689a04e88c1caadbe3efaf91044417
font_01_sfnt_off000117b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 10392 bytes
SHA-256: aa02fb9663a4289b32159804bced0c5be4568b9decdd80368fa87fceeb5f7c6e

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