Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c781ff444a4c4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 05:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e548c5ce2292a81faeaa39d795190a39 SHA-1: 823e026ca0256419938354226181c02d3f5af4f8 SHA-256: 552c781ff444a4c46c486571b07ab23f36f85722d3801630fe316cdbede77f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=q+and+v+words PDF link annotation
    • http://saigonford3s.com/uploads/2021-09-14/images/files/siboxa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a4e6316274117cafd17b7b371e323719/muwetetixaroge.pdfIn PDF document text
    • http://espwireless.net/uploads/file/82967501101.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/87120007467.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/20892343544.pdfIn PDF document text
    • https://remini.hu/userfiles/file/76217280593.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4b7a9e99---wawobufunitixewamawomow.pdfIn PDF document text
    • http://synowka.pl/galeria/file/zakikinuj.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/44402550339.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/51022076358.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/20633838390.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/4f9dc1be5ef6b8a280fa914b4db86581/45259584257.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/49459473108.pdfIn PDF document text
    • http://carbonelite.ru/file/volozef.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/77935446928.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u6i3589pkonge3gs1kc8n4i4v1/55848754223.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/73546839302.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/99688795229.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/melomi.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/2780096562.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109141309035643.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/98482216167.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dotupobunegipanisom.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/ladinubezogofejuliropedis.pdfIn PDF document text
    • https://clubon.top/uploads/files/lakeme.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_off0000bee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE7 17912 bytes
SHA-256: f3f645766f1565937c571cc9beafbf273bdfd8e1d5f5e14d5f9b3a31497f1206
font_01_sfnt_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 10084 bytes
SHA-256: 3bafd132cbac47339351553cb5c6be21730062b4594fb29f0bd10ed64556d9da

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