Malicious PDF — malware analysis report

Static analysis result for SHA-256 0143e19f52437bc0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 19:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb9563e4a4ace007b22bbe22cbdb52d0 SHA-1: c487e18a677de1de48821c00fff5177bb8e9c3fd SHA-256: 0143e19f52437bc0b1808729ef3f7d25abd999980fd52444e00a8a8fa2e965eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=compounding+of+offences+under+crpc+pdf PDF link annotation
    • https://opsclown.it/ckfinder/userfiles/files/wawobowi.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/89270898937.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/slvomttq3dmcani6avmsuhtpsk/fegilibide.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/rovutewawisunoreg.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/83876740742.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/44656456102.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609947fc74560---3602188109.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/lavorojuzizox.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9214e23211---5477086274.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/32373520660.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/xepewawimabitawemaxujawek.pdfIn PDF document text
    • http://susutour.com/userfile/file/pavidujuximofalore.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01a90747be---55940238885.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/87096295057.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97994dfc857dc6a5d18a2b2160f33477/tekomulinawu.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/72615923619.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/97392994760.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06943f19f2---zeranesusowojonilir.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/4024487526.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69eacb1563---zepitikiworusoxovadiri.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609707cbcc9b6---43462453245.pdfIn PDF document text
    • http://jarosi.hu/files/file/61748510123.pdfIn PDF document text
    • 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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 10788 bytes
SHA-256: db040c4cc1a4625de85fd48cabe81286ab2602ef5d30c6ef379a7694caea1ca3
font_01_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 17056 bytes
SHA-256: cbd09b76407c5bbb2268183bc5b2b17458a21c2765c6af501d9bacc602bbc66d

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