Malicious PDF — malware analysis report

Static analysis result for SHA-256 11031bcc7a2ad302…

MALICIOUS

PDF

93.0 KB Created: 2021-09-17 01:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 887c24e727372b2f89c82e32692e6ee7 SHA-1: e765fc3dc9208e79944b0d270a93dfcf701e9642 SHA-256: 11031bcc7a2ad302806feb269221d337e581e12b28de82c5772b7262042fe498
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The document contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO-based lure to trick users into downloading the linked files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=louise+hay+you+can+heal+your+life+pdf+free+download PDF link annotation
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/88727333140.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/kasepaluxipetolu.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/sajedebabusatimezapivop.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/39681020543.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/17879933586.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/11107426170.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c16ovdi0buekd0kvbin47grco7/gugoputevatiwab.pdfIn PDF document text
    • https://umartravel.com/files/sitaranulejubetobozadew.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219151436323611.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/bedimodezarozo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9bc7d40f8095316ce8cc89be47698fed/23882608153.pdfIn PDF document text
    • http://boki.hu/editor_up/73044649747.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/17037995173.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/lodufigotorodejemuk.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea800e5840---naguwudedabewapuwe.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/72043147495.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/26657730232.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b25063588a---2524164055.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/69595498157.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/8307497307.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548efbecc9---64376248968.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/lidatevagifekepuget.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/605231405.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/pesekod.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5670d71fc---gobazamawanotomaxexojoxif.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_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 10876 bytes
SHA-256: 1594f6436299a7168ac3d9e73cbbe887a679cd4a6f8fd7d106025c525e9d3d8a
font_01_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 18424 bytes
SHA-256: 32b78d198e94cab7564b9acfafa172569add9cef584332ac8c8f6012c61901d6

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