Malicious PDF — malware analysis report

Static analysis result for SHA-256 e225397d93428c6a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 06:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2163a575c809bc312e1c70fc5904841a SHA-1: e3fa0e639e8523884f0354d43b26f38152db8483 SHA-256: e225397d93428c6a5da8b780bba38d1fa8b4deec96895fc379a580721deb0f65
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The PDF structure itself appears to be a link farm, designed to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://chamdure.com/DATA/files/mowigasetevi.pdf In PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b29780fcfa---79362594663.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/77025301116.pdfIn PDF document text
    • http://www.heksan.com.pl/file/bodolip.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/nakeledobodubakumimiv.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/52867427768.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/sikiwupuxusegosominiso.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/81967656455.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/71006818154.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4kld2kql4md9qcf4tb28dh91m0/3776778874.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d52ce41bdfa6b0d40129f3dabfdc6aa5/gurorego.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/86251812084.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/lukowanavuwinonebugu.pdfIn PDF document text
    • http://humanlitech.com/files/files/63741043443.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/sefovofalal.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/3212035391.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021917_52312_252.pdfIn PDF document text
    • http://knipia.com/userfiles/file/lanuxinuvaxiku.pdfIn PDF document text
    • http://www.bash.cl/media/file/68386931974.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zojabatakarekugekejo.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/10821943683.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/gokisajutowexajopexexode.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/15968246212.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/mefisinasuxutiresuv.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/db4c323663a3f3218459b142dc09e52d/59931848393.pdfIn PDF document text
    • https://cakkue.com/contents/files/30819694999.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/53100528274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=oreo+tv+shut+downPDF 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_off0000b2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 16404 bytes
SHA-256: 3215f8bb62b839a9c607126d884bdda106c2b25f366ee5cd6a2a920bc1d440b0
font_01_sfnt_off0000dc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10324 bytes
SHA-256: 9682f360b62841f7663dc915eea33f279c1dfa558ea302b453027582a9488254

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