Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead8f7886bec4a12…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 06:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a849c0af775e46c07e7650c5e6f670a8 SHA-1: 9ff6e4d0d7db25d2a2ee7bbb367e22701f4b4b5a SHA-256: ead8f7886bec4a124d8171cc2bdecc0c41f12905bec8651f49239831a1206b4f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://technocom.pl/editor/file/97914437286.pdf In PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/97092245639.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b66c50f5da9634d8952028aa906b8a6d/rojatofigez.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/dudera.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb0ed8557---28759148660.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/vosutisowise.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120a48293566---falonadilibimadoxizo.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/gikebugefasegugugepuwaf.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/69919994221.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/wupofutaxil.pdfIn PDF document text
    • https://protrialse.eu/files/files/kizodelijomumadobe.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/5337841339.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c9a76e214---63428575671.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/90912547920.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/sofisijibefepexuzozuzajuk.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/9v853jic577okpnal6ss8m3fhl/sapajilulepusiwavelesow.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/budaxabuxopivekigepu.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/baxofaluxirerinan.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/bcdb86013cacd9976298817b9bb35ec0/82966654191.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/bejefiriwob.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/binewinaganik.pdfIn PDF document text
    • http://normel.org/files/upload/file/jejizirujajabogobejufozu.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/rugej.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dcbaacea368440289e4777f12413deb3/48352501150.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8f1318698df239737f8f8b4fe2267b31/84000631002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=anatomy+and+physiology+review+pdfPDF 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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 11192 bytes
SHA-256: d2a0fd161f2267ef919d1103e672fece3c6b4b28a431c61074a12e78379cd53c
font_01_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 15888 bytes
SHA-256: ef852db9c5439dd986797f60f582dd0fae876989677f2580c9eec2035d781aaf
font_02_sfnt_off00011a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1