Malicious PDF — malware analysis report

Static analysis result for SHA-256 b41ceabd69d35d17…

MALICIOUS

PDF

75.1 KB Created: 2021-09-28 13:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 650b50a8f889d53ed272f79b3689ff59 SHA-1: f8a4672e37d786efa3253531915fae95bf7e782d SHA-256: b41ceabd69d35d17a811219c19c8e4e6abbfa895ba8fee79af17ff5dc3e5f211
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

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://internationalmedia.com/userfiles/file/titusi.pdf In PDF document text
    • http://unseretochter.com/images/file/torezekepox.pdfIn PDF document text
    • https://ijp2.com/contents/files/fewefokevotitare.pdfIn PDF document text
    • http://feminella.ro/upload/fck/besozimegifutunitijisufe.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/9498665882.pdfIn PDF document text
    • https://kapefashion.com/files/files/jofiler.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c92d617a1---58478279910.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/sewiluvijagazafojesos.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/38694092424.pdfIn PDF document text
    • http://inphilong.com/upload/files/99311680592.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gojepifavopobesezemusakaj.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/136997584.pdfIn PDF document text
    • https://linker.tw/files/84937990937.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/16976676166.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210910052709.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5dc707cdd06323ccdc510f3d39b829f7/81103208880.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161496569baab7---26834819623.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/97166270729.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/sawipaxekuvanopiri.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/91756054970.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/deb90f3ef4c5caf18e36321047349177/dususomimijojafivebur.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/14059512239.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109040906342770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dwayne+johnson+emily+bluntPDF 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_off0000b9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CD 20064 bytes
SHA-256: 74714a9c5531415ba88a44cd80fe75368d361ffab136fea7a4aff58a73bfbf7f
font_01_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 10844 bytes
SHA-256: 6a5851f59e396e4bc407c87885c86a4b274d28d8932302eca9be311d3b718259
font_02_sfnt_off00010696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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