Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b4c80ae784d9b8…

MALICIOUS

PDF

69.2 KB Created: 2021-09-09 03:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86e3155cb15096f3500746ed8d987b12 SHA-1: e25fb62e7f1b543a9ec7c919e697e3a68be28721 SHA-256: d4b4c80ae784d9b87481f8edbb5d84162af310c516babd77c6c8776d11eeab85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload storage. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=pokemon+emerald+1.0+rom PDF link annotation
    • http://cpgny.com/userfiles/files/pegubatatowat.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3ef56668---keferifo.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/62634894512.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/27101857036.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/48219059624.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/97386882305.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/dobebudo.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/34046359488.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/viruzodun.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosuxifuwomizawosawe.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/volopo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161357b8803524---kobunada.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/48827856943.pdfIn PDF document text
    • https://virker-ikke.dk/files/xejetite.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/42932716880.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/gosixawitijavafebewo.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/81538034453.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134ff13444ce---zidetefekipatilobiramize.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/nogerorimubo.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210908_3D456E008C588E60.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/81766372687.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/davaru.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109051423155370.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/17056708464.pdfIn PDF document text
    • 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_off0000affd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFD 15596 bytes
SHA-256: 26780e9be24b026684f7ef11f6d112d3ab1494881b27fc7f5c047adc80880fe2
font_01_sfnt_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 10384 bytes
SHA-256: ec2651829333ad21f8849dd8aa37592de949141bf9b2c724c56027a3103055ad

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