Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f4429204604d6e…

MALICIOUS

PDF

124.4 KB Created: 2021-06-26 00:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dff5aa42d2b4df6b18e5b637e2cff755 SHA-1: c341ec5a4ef5dd9a794f95e6cff4623ebb9769c2 SHA-256: 27f4429204604d6ebcff13252290f25997a18c9ac52869b1a29ce8ad23d7cc81
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting its role in directing traffic to potentially malicious sites. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/9bg3c812u0p2l64bbjuvanc3p6/68832699842.pdf
    • http://shqinze.net/admin/upimg/file///41622546541.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74ae96bfce---munotewuvupefovonekunipo.pdf
    • http://akcjonariusz.com/UserFiles/file/33559893506.pdf
    • http://saokienviet.com/uploads/image/files/82315225279.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0b437007---94143291287.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/42a513677490822b24bb6482fddcb039/72672219492.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fadc61d93---82891346830.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35ba865d15---xutojojumolomugawutejedob.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/irdk5941e5g2ceb955g7eipsiv/fuvonugakexa.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6aca9a4cc787f8e83e64c05b576cec9a/80061286061.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099638f1db7e---38989639526.pdf
    • http://lycee-elm.org/userfiles/file/13233338733.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/dapupibodidimavudukekepo.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/04d89ec908fee8e86aba14b4bf0aceb7/noduravuwub.pdf
    • http://alpha-th.com/userfiles/file/63283354386.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b94078e4639---57220284222.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2e1c30a4---49229001591.pdf
    • http://stressmanagement-karriere.de/userfiles/file/45849318645.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793dadae8e1---89576908978.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084928c92175---zabogififajiwasafapabal.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b4c0d24d---vuredizufutevidiwagib.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0e5baa4a33b33c4b8e85d5274e44d53a/ketowupogek.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a89913bd---75158056666.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84d5ca4fc---86876399651.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788951d95f7---7988620920.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+type+of+radio+waves+that+are+diffracted+the+most+around+small+buildings+are
    • 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_off00017bdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BDD 16792 bytes
font_01_sfnt_off000193f4.bin
cee0e0f58beeb0b5daa95ca7638c22ac107e2ef7d07958148cef91ba9fb2da8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193F4 11536 bytes
font_02_sfnt_off0001aec9.bin
f6584bcdb12acc4bce458f888dac465170518c0efdf89c3e57a659531c68f34a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEC9 18800 bytes

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