Malicious PDF — malware analysis report

Static analysis result for SHA-256 0535f1a9fbbabbdd…

MALICIOUS

PDF

92.6 KB Created: 2021-08-06 06:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4c188bcc82906e2140b3a40844e5fb7 SHA-1: 89eecacbb761410c677e0c4d3a6feaeaed1fa6e1 SHA-256: 0535f1a9fbbabbdd9a9cb1762a90ce78fa670b0ecfcaa5d8d6eb671e29464f5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=exercices+accords+dans+le+groupe+nominal+cm1 PDF link annotation
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/29a74a692761508be84504de7d38097a/warevamemebetinoxukozowes.pdfIn PDF document text
    • https://miet.hu/kepek/pitukesimuvelagapir.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe59e7f15---72843143444.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ad6a7f49---jenuzudenuxonap.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/kejupumanepew.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8e58efad---41834618314.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/fa1dsr1ruvsofn87vmodrfoj27/pakizap.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vifenelubijezu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160756f9a801c6---dofubovifokiw.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/kolesirojizajunebizaridog.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/dokosovin.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/f7b85cdf329d6e62002119986d991669/koxopujip.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/1686043178.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/168b75d55ce505404f56428f86c9a7ca/wuravorefukakolubumafadof.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efff9999c9---34384686737.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/xufovosaluvuj.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ed3104a2---xavanero.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/39ghqo9j1v5aot1tia91kl2sl2/rejexifibofemibarozajul.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de156bc8f4---lelamesegin.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec5cbaaea---82818039075.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606dfb0eb448d---5714740851.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/58998604003.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/i9vbo4rpianp6scvc7b4tjgrrd/57878485856.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/lubadipabakexitixesikowax.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/pabatafaxe.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vufefi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9o5s66aguofibv573al2hav2o3/23357200611.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 16684 bytes
SHA-256: 0b66887e43cc35630d0970669c797ecfbf492bb097841a83f6681a0f5b87338d
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10996 bytes
SHA-256: 1bb620a0c3024b180d26876bb6a36f94b0680d66c3becf497c393b7acf28c48d
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 18832 bytes
SHA-256: f636456c4d26314132e6c625aecc051a032122da01162f888d0406c9a4248bbe
font_03_sfnt_off000149c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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