Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6d7c97415e57f9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 23:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 83a3d239bb667e98b5f87f91944db528 SHA-1: c016fb88c48f54ee92f5fd38e6c53df4ae1ffb9e SHA-256: 4f6d7c97415e57f942f3eaffa9140e5b9f9dc24b1c749407e25702628a65a513
156 Risk Score

Malware Insights

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

The 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 hosted on compromised CMS uploads, with numerous URLs pointing to potentially malicious PDF files. The presence of multiple external URIs and a link farm structure suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dichvubaove.online/upload/files/2517307639.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/30235566588.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/79065546739.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345617b401f---piwosamelovazujupi.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/89940518737.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8aa5810e7---36628778478.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/21754360532.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/33870191396.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/59784325807.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/resupamirofug.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/51919122307.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xojemo.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/98175403020.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/4672618465.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/78520464691.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/10296248453.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/xelelefuk.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/fituvawuvo.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/kitaperekizab.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/37590565730.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/sedagefomexozofiliwomi.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/91486649117.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/13456437392.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a0f765ba67b2fee3a2db8bda8f0e529c/pogozaporaniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=english+grammar+in+gujarati+pdf+file+downloadPDF 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_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 17888 bytes
SHA-256: 39c2ce73db757418691b48134cfc4e36af7df4ad1c10cc03e47743be1bfc7d54
font_01_sfnt_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 11244 bytes
SHA-256: 220337d665e0471e00b10d13d29402755d6b571a129f02fbd3767a2740a1ee93
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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