Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7cdf529e7443c7d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 21:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d2aebd31a74ba960b1ddb58a1cff884 SHA-1: 3d4ac684651191f2f350e96e199463f5ccabfa92 SHA-256: b7cdf529e7443c7daf44dfe533bba837887f11b5befc2a0637735ff7143caea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=killua+zoldyck+wallpaper+hd+android PDF link annotation
    • http://abworder.com/uploads/files/88275041142.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vowiluxepegitomuvisezo.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/81046880052.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/25598224955.pdfIn PDF document text
    • http://ecole.ru/text/images/file/67098931837.pdfIn PDF document text
    • http://www.andreapondika.cz/file/70941105190.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/40228289138.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/jojopew.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/jorawufedipetujen.pdfIn PDF document text
    • https://alev.az/userfiles/file/86367916493.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/21610319976.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d9ebc8cf---99439463507.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/tisadoziwosesodefu.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210903_9D9BB5FCEDD27E2F.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b3379f0e---bujapavakebaz.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/debumi.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/juzaw.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/19110567786.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7qthi8egbtoeda030fsu9918p1/pamasekokak.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c24aafda---71149191770.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tivuvinubiderovasamodif.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/jutezosurag.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/31667618939.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/92996225260.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aba3634c062dd6b76a4d57a2ae54957d/28643499048.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/78636109576.pdfIn PDF document text
    • https://codecs.ro/images/file/94273151292.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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 10788 bytes
SHA-256: aa278aeeb15c8bf653f122a26b5c823f689b3d218de321e6d1ee8cffb185bde8
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 18312 bytes
SHA-256: 4de697dcd8904adbb6bcd2f0e1e8185648282ebb0ed5afdc70cee03a8a81bcdc
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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