Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6bc08dc1b18ea5…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 04:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fcabb97b48f5910c6619565677a31afb SHA-1: 7bb2b178ba031c559c9d71df555f66a6c2f19db4 SHA-256: 6d6bc08dc1b18ea593fb1dcee530cd2182168f7a95adb1d8d36d50e4739853cd
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to directing users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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
  • 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://jerseyshorepirates.com/userfiles/files/dazobikuso.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613182957c653---80759205009.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202192153172758.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393ee0766c7---82719545144.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/tudawiv.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/nakobuv.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/rigegapibowolixixiwuz.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/84119941692.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/falorovetafabuwa.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/sasuwigelaj.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/sepepopifilig.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/dorojumonumamapepuralaju.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/foxubire.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/60a35323825bcc0bbe87da2462b1d31d/45122587585.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/4716149688.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/48972366396.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135acb135856---tilapeniwof.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/nigadifosibopotigozuf.pdfIn PDF document text
    • https://virker-ikke.dk/files/56199792747.pdfIn PDF document text
    • http://voijin.com/userfiles/files/24541508526.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dacc582ffec7e0a6a1a120ab00b957e2/lafesinuv.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/64280094718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+anonymous+browserPDF 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_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 16712 bytes
SHA-256: baebd22e88755313b07bdff5b1d512d239463513eb51b93d8137c3ab4f98e4e0
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 10624 bytes
SHA-256: 455a80f6c871d423dda263596100c990a3e5b5ea07b9a478ee8fff5233c6d4f3

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