Malicious PDF — malware analysis report

Static analysis result for SHA-256 890b9c5eaff38ee9…

MALICIOUS

PDF

78.3 KB Created: 2021-08-29 10:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 80d38984fc619e0aef03bb9457f014ef SHA-1: cb817a0abe14811c9bd816a6171efa4ced3de83e SHA-256: 890b9c5eaff38ee9b02ecec97b0bbe82f2c1c178c5112d292caa763ae0627da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic firings indicate a link farm strategy, with URLs often containing 'utm_term' parameters, further supporting a phishing lure. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smidgel.ru/uplcv?utm_term=time+and+distance+questions+and+answers+pdf PDF link annotation
    • https://kopari.hu/files/file/nemafupuw.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad37d485e---33370925615.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea883939c---645263389.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/88961308731.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/sunexiwugesu.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/2148534079.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///juwesikapab.pdfIn PDF document text
    • https://bonacorsi.it/file/11964018794.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609224c5cf350---rafimavovibiseku.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/89t557b8342drm7ojibf733rg1/14472770367.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zaketipuvafo.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/34356870082.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/15536762492.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/38jg9rf4dmtindjgk6413tcgda/28915235362.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d807fab709---64676012793.pdfIn PDF document text
    • https://capecoralliving.com/media/file/sufexexilip.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/58398478311.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/71eef3eec3e35670e673cfaa4a6737a0/pazarivumopebojekar.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae448b4b6d8---95219769243.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/12446290444.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af44294222d---55333092106.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d966872ad45d116015800a5c4301daf0/penizo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/11684008099.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c77ddd82e---17525103533.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/zigazenagoj.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/74578084585.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_off0000cc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 17160 bytes
SHA-256: e1d0c82104045bf735b85c4a627ca131328d5d7fda5c88bc6914bd64fbb7f274
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 11028 bytes
SHA-256: bbcbc9cfde2dcc45c3188842fa949358eb8395093b58d3d9fe941c243b3f54fd