Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb19b0b4ec2d589…

MALICIOUS

PDF

91.9 KB Created: 2021-07-31 14:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: eaf2a3e40a0b9340342d49915dc83517 SHA-1: 9ce916b5eb5a97a3f6cf0f403fe781e7df5c5562 SHA-256: 9eb19b0b4ec2d58947408c15376973d7bf98b89dfaab8467a9ae9ebaec06bc06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=how+fix+forward+head+posture PDF link annotation
    • http://ozkayalartrans.com/userfiles/file/wurukadu.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/38005947522.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/29192431516.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160770faa9161c---90853008825.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/77917528958.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/mitirove.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01cd2c597---38852461488.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lb0vipvj70qlgmuurjhnhf7pc9/74257356253.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e45e9b6e36e---22958225426.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/dapabasurazuv.pdfIn PDF document text
    • http://zerosquareonline.com/file/84550103705.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/jatimapinalu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094281c4ae3b---govorumafaduretibubogu.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/13880467226.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/xunofodobum.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/deporupora.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/79187263753.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978b4a55c27---47918131730.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a61b1997e---55939539693.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dd1798c1157afa7d7cf5b9f0426e225e/23723553234.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/45810085691.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/07995bc3b04227e70918b11ec9d2b0d2/nijugepapel.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/29403269390.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/lilezomuzuvufeba.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0cd002bb---kurubisubelukadeg.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_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 10724 bytes
SHA-256: a860c906f715733b4d4c1258cf6e293ba1d4f99176a80a0234fec78df9a4aad1
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13375 17140 bytes
SHA-256: 5e1d399e62f9f41cbcaf33c879497d22992944bc0957e7f97aa946c5cbb8d216

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