Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e0c06f05c930c8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 12:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36eab187c5710b5a2e91dbc85012b712 SHA-1: 7bceb65579895479593b678d5c1bec14d56539a0 SHA-256: 88e0c06f05c930c89aeca30c8a8f89d56461b323bc429cd745c91a2caeee5c72
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of multiple external URIs suggests the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/44175824532.pdf In PDF document text
    • http://elturo.ru/img/upload/files/20911907754.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/85757631269.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36058595940.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/28582615678.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/3106772650.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/lanujepufisosijepix.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/guxumusalogejatarakux.pdfIn PDF document text
    • https://abss.pt/userfiles/file/25674597065.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210905_091626.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/waxere.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/66094668392.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/47268083706.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/868714499.pdfIn PDF document text
    • https://network-italia.it/file/87146747910.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/66111184545.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/levukari.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161380aa5c9d25---64019206183.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/85363936703.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/tamajupapipimeduxaxuzozeg.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/741f0004fed161cb84d14d57b1b57175/457803488.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/659d20686a7be526e55514de22a6cfde/sukezezasunekasavanab.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/fefatix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+send+games+in+bluetoothPDF 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_off0000bb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB67 17064 bytes
SHA-256: f3bea50df8fba254d22c5608b81df570f3a3f5deb1c084e3da3af18a5f02e799
font_01_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 10912 bytes
SHA-256: bae484b05b983c4c1f6fa6cd801380d31666ce17b070c3ebcda69788d0f72119