Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb52662adbae14fd…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 05:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e2890189c31fcf5d9eb23471e2298bc SHA-1: 212791256e4c28e02cd92413e4274f4858b41225 SHA-256: cb52662adbae14fd9fc73bb72d3b9b2fc2b2d8c1dc88bdbdcf60c4d5c6f55975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous suspicious URLs points to a lure for users to visit potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c2a19600d---fatukizogo.pdf In PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/nuvekivot.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/puwafevubomewetoxu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fb5e38ee6c567c6e9c08e2d1f74d1471/82146378276.pdfIn PDF document text
    • http://simonide.org/userfiles/file/juwesaledosidako.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/48386877918.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/98981885103.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f16d145d5---bometugigubo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160768d5a08b7a---mewuvelibajidowumibugefi.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/70258681159.pdfIn PDF document text
    • https://31app.com/userfiles/file/woporupusuloge.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/70484234322.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/bisumeparazisobadamano.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cfeb36340---pejabowunoporaparas.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bf7980ca---giwonemekejufadedisiban.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/50017256418.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/42844789685.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dff567c50b9---53174737388.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/sedatuwekigaxetonawinusux.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/85076853678.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/23755892201.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/92825524596.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bf1eqem5n5j2s23elv0htd4d36/74271141120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=reading+comprehension+for+grade+10+with+answersPDF link annotation
    • 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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 17416 bytes
SHA-256: 5ef5b991a799cc8a2041af6e0cb95d2026a3dfd706a8a7fe21f6adcfd27b2786
font_01_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 11324 bytes
SHA-256: 941d6a5ae8c457d09b986f84044514a5395b2c49a6e9c92cbe7370f0470844ea

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