Malicious PDF — malware analysis report

Static analysis result for SHA-256 62cdd9e57410f407…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 17:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1e324e75d09d55f6db2ef0d46a929d7 SHA-1: 8a324a0dc2ac22535662dccb0648784c87eba7e3 SHA-256: 62cdd9e57410f407b400abc30efb9077c7709a7a09f41f3331c4ac4cbd7311cd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/p82grgt2ra47bchkrv2ro51oa5/fizukexi.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6d131cbf3---20944677001.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/2491518425.pdfIn PDF document text
    • http://kelvista.lt/images/files/wozasavobesivuwavulesej.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610867e2038d3---16729746335.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/jebol.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084138d923ed---14704089573.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210807_712A59D1D9D11767.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/30107706043.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923305a7dfd---81810600898.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/83286310522.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210831185633.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/7681143171.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62798cc10e3e44388e0456b063c9aa86/13123109860.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1628677592.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/tuzatiretupupapatumigagev.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad466b9570---43549025377.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/33b920e63fba116b7afa0314089bfb89/mifagogebudufelobug.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/ragefavuziribifepazise.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3g2tgstj6fcqq9at2tg8nkfmg4/48306680824.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/xiwivi.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/37098554885.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/xuxixamisibosozelimijos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=brinks+safe+manualsPDF 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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 10404 bytes
SHA-256: 79b9ea9f3c40894479da4f691d81d7850d417ced807c2bb956aefbf8fdf3a5de
font_02_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 17660 bytes
SHA-256: 2565e11743b892b86e7cd71272b81bc7d7931c459e26c71d660e237a48a176cf