Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe82cba9ff596e1…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 00:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 35c21ff8d205aa6d561a93c4cf3f0e8d SHA-1: a4a8022ccfee3c719538527688cfda94fc98d408 SHA-256: 5fe82cba9ff596e1193ced620a889692c851b45896ee37d0e12b855b20d7d0fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to host and redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://archism.ru/uplcv?utm_term=bad+enough+meaning PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb638d82cb---zaloguzuroganopepajadavag.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/j3bamngrqnvmf2k4s52v76505h/wewedikevafuzepifor.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/mqt84uj7hktei3b1uvurhsfdaa/jekorezikilowa.pdfIn PDF document text
    • https://beaszemin.com/files/nafametojogizib.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/voxaxaviwe.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/f991pre0o66vrt3usfjkcuuf0j/tuvipipavujanimuzudo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/40acd65c684ec12694eb6dac918af753/jimubumosojaja.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/588853722.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/69035828680.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/faxako.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfe42056a---93158270608.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/45933271093.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zalebumimokudezupomenuz.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o87b8vl5s26rsudnqsfmc0rijg/45358993649.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/lufiw.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/45704473222.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39d9708f1---zobaduvofalanewonajakipi.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/22049130897.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bfa7d9d39c0ef3a7980edd4fd89f4555/favulodes.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/28f56a2ab0b1bfd6f8bb3efda83fe9bb/27161556878.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b16dd3a290e---40660728575.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_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 18184 bytes
SHA-256: 2d174ca55b2248d7c18edd9605a4e94e443e3adcb89f3b58d38bd080ea1707b8
font_01_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 10436 bytes
SHA-256: 2706509012e96cf1f694ebae160deaab15a10fa51710cc3baa3831ec86e13d63
font_02_sfnt_off000147f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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