Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ceaca48f49b3dd…

MALICIOUS

PDF

108.3 KB Created: 2021-07-18 07:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3614750287919ce8074c9a80acf7dab SHA-1: d81dcb4e20ce0a4d7be0ef66721b6cc6077a467e SHA-256: 36ceaca48f49b3dd3323b2b2b78d9e5de875aa8419cb3c84b5607841fd7f15d7
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://memphiscentral1969.com/clients/865565/File/30283869058.pdf
    • http://rideco.hu/upload/file/40348205172.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b55hepmlquavpoh6hj04t515h3/23267363191.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/batifanitudo.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6c66212b---juputozufezexi.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/38131382727.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfda38ec5c---67865056005.pdf
    • http://riph.pl/userfiles/file/38045384175.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff4cd653a---muxulufomurulowisejima.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5ad32a3665ec74c807c244a82ed64179/powosibotur.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2927893e18---920190598.pdf
    • http://centronegozi.com/public/91858380702.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/608lonq12mmpi794m6e720jg82/nazakibagovemok.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/685qs760tug16lnikinhtc29t9/fatixoxaxili.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f42cef52---buwevilepeneduwe.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aea38e13f82---xekimofowapalegoxaduwe.pdf
    • http://sahrugs.com/userfiles/file/lepixasanitejutasezogeri.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/midowolenejike.pdf
    • http://ninda.vn/userfiles/files/tujotifukuwekup.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eed3bcf48b---27096921693.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/kdgp0b7vcm7uimi39f79b9o8qm/32669879448.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddb3b1832---39553091287.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ed9ecc9efbcf2eb54d9fb7bda84a50b9/3642601253.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c61d3e59c0---74539881362.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=to+be+conscientious
    • 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_off00014855.bin
55539499724337c47b17ef4d7d60d2978ec4c24f06641fdd2eff8ce3ed0b87d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14855 17400 bytes
font_01_sfnt_off00017551.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17551 16792 bytes
font_02_sfnt_off00018d68.bin
d5a8297b5a2f23e4b9e3e909cca25467665f6e518d154e6c42ee7ad1b7352a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D68 10120 bytes

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