Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57b9ff41eb8cff4…

MALICIOUS

PDF

69.2 KB Created: 2021-09-30 18:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4b44df2af1e249b52accc6b4bde8ea3 SHA-1: 191dd389c2852ffc81670141a4673e8be0ffc554 SHA-256: a57b9ff41eb8cff430b409465bcd7d36637d4713e95c340277f040526ecd41d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links pointing to external PDF files hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The document's structure and the presence of multiple external links indicate a link farm designed to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://unsersohn.com/images/file/939470977.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/doposamusuxadujoxojo.pdf
    • https://ef.msfoody.com/upload/files/88369638546.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/wopedilixezizubifas.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/vedenubovixovupuwujojegow.pdf
    • http://dymenahealthcare.com/upload/fckeditor/file/2924013206.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146976f19778---95171981332.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89605327618.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16152034c82e61---nafalanojekerevinarar.pdf
    • http://uniradioweb.info/userfiles/files/wodawuj.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e6540jch3e83di2328eo4eomav/nixuwemevufeviw.pdf
    • http://firmen-bekleidung.at/userfiles/file/weromexo.pdf
    • http://srs-budapest.hu/uploads/files/64857589740.pdf
    • https://pharma-tools.eu/galeria/file/9342039242.pdf
    • http://tantusmarina.com/UserFiles/file/fuzutirumufajunilalere.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/pixegosizis.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6hbhjm1s3jf2crq99rldj4qv44/wewavotizivizu.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/vanojotanof.pdf
    • https://coevent.ru/upload/files/56168063725.pdf
    • http://jongauger.com/userfiles/file/zufefazinuxolej.pdf
    • http://sportingfoundation.com/uploads/file/66139186989.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996af84e7e---gotasazolafek.pdf
    • http://avanti.pl/userfiles/file/fixet.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/zasuzinikevunuvogojuv.pdf
    • http://casaledellasignora.it/userfiles/files/52737059611.pdf
    • https://jordan.si/dokumenti/file/27025532605.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=after+we+collided+full+movie+to+watch+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b190.bin
070e01c8b49392b47cc3b86b89e2aaf238e9c29201589433d94aa5bda22ee063
pdf-font-stream PDF embedded font (sfnt) at offset 0xB190 13980 bytes
font_01_sfnt_off0000d416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 16792 bytes
font_02_sfnt_off0000ec2d.bin
1716c4f9031bf6a0e58ad191a44cb5555478a24e981dcc36b1e1937f4f0b7ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 10804 bytes