Malicious PDF — malware analysis report

Static analysis result for SHA-256 2568068a01334ddd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 18:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 78b71000de0c2a0436024c0e3ebfc14e SHA-1: 047a868241125b4ae4332455da6c854c0ca592b4 SHA-256: 2568068a01334ddd64bd3abda51f17cb39dda564ead8962bbca1cb0b7a0b66ce
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or SEO manipulation scheme. The presence of numerous embedded URLs, some on compromised CMS uploads, strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://decaiyun.com/upload/file/210912133031142091iy3dzv90wngd.pdf In PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/pepisalexusulerazomulunas.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/53680456810.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/18805844555.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/6296414706.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/dezolupasoguveroxu.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/pavigagapumesi.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/gevobubuvopigotolofa.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149731ad4bf8---mezefexip.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/xumizem.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/88362480447.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/67648471950.pdfIn PDF document text
    • http://origo.ws/userfiles/file/170518736.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/4714806755.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612faf9980e58---62669739880.pdfIn PDF document text
    • http://jsdarvin.com/files/melodif.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_24_17_55_48_7824.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/fobogasazibe.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bonexifamif.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/77416830321.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202109251852561656.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/369777d35c5623329a2abfc2a8472912/gipasadubojoxorekokopozaf.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/batakoneluferedekejatuvuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hum+tumhare+hain+sanam+full+movie+downloadPDF 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_off0000aff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF0 10860 bytes
SHA-256: 56399da01ca2563a9d05e143b3d0c3166b1143089464373afc7fda1725e552b6
font_01_sfnt_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 16352 bytes
SHA-256: f89197468b8c2132e8bec54572dc960ec9c7ff08485c9a14659dcf8dde40351d