Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d810f700015885…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 11:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 44ade6203a45626a90e783add3b47160 SHA-1: a25058c5b683857a58506bb14c9668383d89474d SHA-256: 79d810f700015885292175af473e893f29d368a444c3ced27be5b41296451bdf
262 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript T1204.002 Malicious Link

This PDF file is identified as malicious by multiple heuristics and a ML classifier, with ClamAV also detecting it as a phishing trojan. The document contains invisible links and a link farm pointing to various domains, including one that impersonates PayPal and redirects to a 2Captcha mod APK lure. The presence of multiple embedded URLs and the nature of the lures strongly suggest a credential phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://crysiq.ru/uplcv?utm_term=2captcha+mod+apk.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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
  • 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://crysiq.ru/uplcv?utm_term=2captcha+mod+apk In PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zuwibuwefogikopexowewane.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/23600377219.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109140605301267.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/juxasosedupetunukuzu.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/jisibifajamege.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/zagaxokixogefuzepujuk.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2541db0f15a710b341e71fbdde3c1221/wogavanulamukofoxo.pdfIn PDF document text
    • http://huiking.cn/uploads/file/170933119475.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/45449304502.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d5f2e0d0cf45c8283d4442efae0a0f56/nejujimogasige.pdfIn PDF document text
    • https://aokman-drive.com/d/files/36008261038.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/58cfdedb8915a406d0208905592ece4c/66946482734.pdfIn PDF document text
    • http://eksternest.be/images/file/14406706800.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109040017592945.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede9b96763---39349080755.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/kalusuwafedizovawez.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/najudexusuvogimisesabezef.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/jekibapobazinulibikor.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/66949326552.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/27041802744.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/978cf0a3542957b5d609bbdc008485aa/61752843158.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/75977882673.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/ramedokodirapanapur.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/dagewubiteni.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_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 18804 bytes
SHA-256: 5e49cdd718da2e4b9b371c899a51012b725d84060382e9d59c97663f49aafe5b
font_01_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 10252 bytes
SHA-256: 268d9939badf81fe2d29c27570f9465b57ea65168c2eb82efad97a62fa9f452e

Open this report in the interactive analyzer, or submit your own file for analysis.