Malicious PDF — malware analysis report

Static analysis result for SHA-256 7356c8cb500bed23…

MALICIOUS

PDF

94.0 KB Created: 2021-09-07 04:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e396a99cc59f33f18c27fea673555d7 SHA-1: 736addd0172ad3ebb6f5c983fc6105f2cbdf369a SHA-256: 7356c8cb500bed238e1cd11bc74d4dc5ff5cb57c8fbb5466cee2bf4620921dfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://pobierzplik.pl/uploads/files/wegemituporavusokesor.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/3fc414a702b2e488361d71f5848a2d86/jemoziwezeralidawid.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/rasesola.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8fa73956---punisomezedekewatinaj.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/niketepesukoda.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/68596580754.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d482a9b8---vimojebiv.pdfIn PDF document text
    • https://shibbirs.com/media/files/nozimudoleziwegikutiwebol.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b88ab145---debogepirudusukafor.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/77396887504.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfbb3faed---lufevekam.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e40469a82f520b8744312f83826eaef2/67258510155.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247e47951b---55515318453.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d0f3c39a0853fec3149e4971262cb841/lunigidolukavotolofagoda.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/59478163790.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/bisufukise.pdfIn PDF document text
    • http://jaqalsports.com/files/file/lidubijajerekuzukori.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/wugudiki.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7101faef8e---701610183.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/9314544689.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2088a443d4dc7f7921dafb38a35c6923/tulademoxitadesex.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210516090533921.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/51f82103b0bb1e4f53012f0bc79c4d6c/repejugofozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bhaktapur+map+pdfPDF 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_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF8 20312 bytes
SHA-256: 36e27f55303e36f154622b416118f49ab2f77c03c4d66a3de716bdc714960948
font_02_sfnt_off0001537f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537F 10344 bytes
SHA-256: 112659bf6c3db562b8b2dc8b8190f37865205d49446ce11b73ea329f65d2b1a4

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