Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0df96b1a357dfe…

MALICIOUS

PDF

93.9 KB Created: 2021-06-28 21:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6c5882565d55cbf3330f20862300d444 SHA-1: 33a1274884e81482d1948f3257ee4a4d91f67a0a SHA-256: 5a0df96b1a357dfec23a4dadf7bdfedd42f4988f137439a2a28cc12c54fb721a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, distributing numerous URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to obscure the ultimate malicious destination. The document body is heavily obfuscated and contains no readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://vankouwenenmastop.nl/UserFiles/file/75907300165.pdf In PDF document text
    • https://aurorabersinar2.com/contents//files/31291623264.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a3f15605---83990821485.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dlegn4vr7fotbopioj1tg1hr1j/75976533663.pdfIn PDF document text
    • http://temple.mo/userfiles/file/36679596534.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ab00e9a9---ruvibazapudiweni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d41669db---38642704932.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d13fc8475e2f77033d1302d97af3ec1/mivesekogugifo.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/32656852630.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/mipukegunoborakowe.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/8pvabit6uk053b5cjqv5e7m3u2/39974243686.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/99242784756.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/92d23ee5a57831976f00ce57d246ad61/zugevebuzafagudosupudosi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46cc8d99fd---95128435173.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/91b0c46ab0a5394db1251adc280c51be/tomukaleve.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d602b09350---62220897743.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86674831887.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/82441002067.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bbf488e982904403e473b54b43695950/mawiw.pdfIn PDF document text
    • http://normel.org/files/upload/file/mukexevo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68b5cd40c---77020494073.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/89495845220.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/bedizenemefudifitezoke.pdfIn PDF document text
    • http://www.asslar.de/downloads/47696416878.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kawej.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210608_204221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=catching+fire+book+online+free+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_off00010e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E80 16284 bytes
SHA-256: 5664309a0d2af9297d7863aeb3127907465bb38d50fdc90b1f983115cf969be9
font_01_sfnt_off000138bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 10992 bytes
SHA-256: 1f6387833cb7c2abf5a1a6f52c0ee893468c125e86751964f75f8e8db7e0627f
font_02_sfnt_off000151ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1