Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb918d2e43f6f6f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 13:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f3d0e1d6613ff9cf5f082415f24b4f8 SHA-1: 4e50ffde58cb033ca2b7e17e1ff6200f677f141b SHA-256: 8cb918d2e43f6f6fd28ce019bbde1361d327317d76d3337caf9281b8189f148d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://pixomot.ru/uplcv?utm_term=rowdy+wrestling+apk PDF link annotation
    • http://itagqatar.zajeltel.com/itag/file/files/91234264246.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/lurupur.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/kimakerovusesogib.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/galotobon.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xofidija.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vebeduwikir.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/gujuv.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/37418044250.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090101015873499.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/44604103568.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/fikolesuzufudog.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/50530902171.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/67836165618.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/20278421278.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/togefapepigafalagufis.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef691cdc26---80933448689.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b683901cfde3199c55d88339e0d7a34/66084056027.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161353e948f5e2---83519038781.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/lodarifalajozigizetuvokor.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161434baa8bf85---61481213436.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/27062438945.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/90257363944.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210916045700.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/10439252872.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///tisulabipapuwamam.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/84600224325.pdfIn PDF document text
    • http://na3.it/misc/file/xebabifuku.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 16508 bytes
SHA-256: bd1f193f35badfe01b4e03a393efccf3722852221baf101f47cf9ba4e4ea9726
font_02_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 18384 bytes
SHA-256: 89434d116eaf15823a0d3c886b64499399afed6b2b82a4dfb2fd36c43aba850e
font_03_sfnt_off000116b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 10904 bytes
SHA-256: 6947979f277d89a9bf5d739a1d46b45e7d2cd2d2f2761fef34214cdf457c72ac
font_04_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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