Malicious PDF — malware analysis report

Static analysis result for SHA-256 edefe64995ad4466…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 08:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48b5661d21bb21ec956115cf1ecb24c0 SHA-1: 6984382c3520c8d08f5e5c293c6863f3e0124353 SHA-256: edefe64995ad44668336e2aaa3e97dce53757c85c4fd20b4fbbc402c1e9e0dec
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bk.knu.ac.kr/ckfinder/userfiles/files/99214071295.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c115ae12ca3---8762192528.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/mapinelazuzijeka.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac342a57b80---93125826298.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16095d78f1d83c---57324521254.pdfPDF link annotation
    • https://dobski.pl/userfiles/file/gizegurerakufawabojom.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49c671497---dexerujedamijoxejufinimol.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/zitewi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830e494c221---gawalaveto.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/8909815728.pdfIn PDF document text
    • https://windsbs.biz/files/file/lukudutuxigowoxis.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/18522393387.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/r8j3fdhs0thmabclg4d1bq52qd/lobap.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/mijoboxijemejewube.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/3614809613.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/mibo8sfj93e79fg6jj73a4i4vk/76270644312.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/089bd5b197f38aa5dce36068c4964123/guxar.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/49b4f5531123b9752d25766357c2390a/270929036.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/vorasu.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/kukimuvaxafupudupep.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///12927080101.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/pesidisepo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/lekomamitux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=multiple+tiff+to+pdf+linuxPDF 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_off0000c23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23E 17844 bytes
SHA-256: 83f7bd116742101a011d0eea771b4df1e7530dd33c6402650ebf275cb399cda1
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 10256 bytes
SHA-256: 020931a4b28425f0a325f06da2dfc7c1daeb0e33209f06a39d56cd13ff647220