Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5bd6b4d78ab3ed…

MALICIOUS

PDF

81.6 KB Created: 2021-06-29 23:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef4034beb52343cf74f39697ef0e8415 SHA-1: 5a4528c1aa0262aac46b9a1f3fa069e92ac2c00b SHA-256: 4b5bd6b4d78ab3ed08899674532aeb9c0df1fe4e63e5484ccf1523e9b7593ac0
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 identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. These findings suggest the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/1aeaadb34fddb327e9e610c8cd35406c/tawobeledogo.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d81795d30---73484662970.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a8e8ad33---65683175982.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd21d3840---66294986267.pdf
    • http://haiphongcontest.com/images/files/rurazetinapowexozu.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c4098857---xelopel.pdf
    • http://shelton1961.com/clients/35589/File/26373949971.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/qgfrpfq4car1h9qu56lkkbvn8i/momigutov.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/72898778665.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/25eof505t6q358cknr7tqt7j7u/wutivarub.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/89389866914.pdf
    • http://wamer.org/userfiles/file/49751750930.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82370c270---renikuwovurefolojog.pdf
    • http://chinoboxingclub.com/clients/36032/File/25256228281.pdf
    • https://guruamardaspublicschool.com/userfiles/files/97533840840.pdf
    • http://jedwines.com/cmsCart//upload/file/57988952493.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4a5e73077a609d10cd97257e3164d7e9/gekuwivilofivatasa.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98def8783b---7717930191.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd1e4c2de---jokuxowitirugejonakuw.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd6018840f---xejam.pdf
    • https://perfecthospital.org/FCKeditor/file/89786159119.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087d1296e0f8---65670989084.pdf
    • https://dm288.rs/slicice/file/wajureroxegazemuvave.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8cf255625---naxebigojumerovexibovorer.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/62009755948.pdf
    • https://akapacha.com/userfiles/file/fevisuxijibosepetoku.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/31fe86e4176c09276783a872d01723f4/99145760632.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=equation+of+a+right+circular+cone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d805.bin
a83265f17dff986320c460eb7e156ea6b341e1bf39c52a3973c4a28d358aea27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 17608 bytes
font_01_sfnt_off00010708.bin
b89d875d3753ccfb35371257b49d3745ae4729a328cf810293cb3ff9a4e08e77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10676 bytes
font_02_sfnt_off00011f1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 16792 bytes

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