Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99d56f07424e6be…

MALICIOUS

PDF

74.2 KB Created: 2021-10-05 00:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: aebf0f9d3db6ebd1df9ec27bbbe3194c SHA-1: 4d40ca61149e1fabfe1469ba877375e8458c1585 SHA-256: f99d56f07424e6be519127d77514dd0328ae26064793989459ededf6b86522d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chulintemple.house-well.com/CKEdit/upload/files/lutobosutakevawalinufap.pdf In PDF document text
    • http://greenflameenergy.com/userfiles/file/juwitetexu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16159cd94e6fba---54375892166.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d257541b8e2fecbc2b6d7f055e12621d/4628782254.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/28899482042.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/kemasafudivajojejopu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b0ebc8bd3---35285030446.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/29176109804.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa89f941e4---83636936016.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/22704304069.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/47404767498.pdfIn PDF document text
    • http://rsst77.ru/upload/files/15653059849.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/wupigefa.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/luruziguxub.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/54878259048.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/wovudozoxipoginugofaj.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/nisinupoxalunomopovofi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xopawejo.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/84621849196.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/76901611825.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/75956684052.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614136f57bf73---lezuxevedededubijexevu.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109230448191222.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/95802083854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=html+input+type+submitPDF 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_off0000c15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15E 16876 bytes
SHA-256: ad74b817e5b2d2b6f7e0326762d4f5e24da97c3d03b4c4b935ed33d69e619fce
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 10376 bytes
SHA-256: 7d0e5636a5963ef6fe3d49700706da1ce962914092fe6cc361285099175c1121
font_02_sfnt_off00010332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1