Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb34460d93c051c…

MALICIOUS

PDF

83.2 KB Created: 2021-07-01 11:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93425d4224d7597165ae9832d67e906e SHA-1: eaf81fcbe6b28b89af9ce6233fd71330a2c8cbd6 SHA-256: cfb34460d93c051cb23239f078a15997ace12bc292419c554187f085b245fbac
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external websites, some of which host other PDF files identified as malicious by ClamAV. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links on disposable hosting and compromised CMS upload storage suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://turkuazhost.com/calisma2/files/uploads/25242017111.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210507102626901.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cac65e310---bofuponi.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/regajazitabunotemotarako.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/af514d842bcb26bcf46b0bfaa93dc9d1/71851035760.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a586f504a4e---76053826010.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7852b5354868135e40ebac6f269ecc4f/wixibuzavadidoviguluw.pdfIn PDF document text
    • http://computerdoki.hu/user/file/52140804312.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/9163988960.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc12f3326b0---tilozemewulezibanomu.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/6866b165d11c4935648432ff5f55f4e1/bikababolop.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4da3ab2256---93555039221.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/49049010341.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae299e89373---xelelapaluradosigeso.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/1kaieeqg5art7ak8lbvcji16o0/pitijegetasodi.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/banipunodagusamosi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4tmrlpe6dn05cbdlnlhtk1f33o/riliwitiwod.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kudbjpeponfrkbfa8i5g0pi60o/femigasibipo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/21effff638d13d47902198c2ba1d32de/pepifipejosifebuxesuk.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/vajinulumegebuwewozazadex.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609282232a84d---34957459837.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b33dbef61---53096661165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=magical+monster+pokemon+game+download+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 11028 bytes
SHA-256: 7d0c680b2609898c595feb84839526a5183adc97329ae234ff47ee4ba9967dae
font_01_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 17156 bytes
SHA-256: 2acbaf518018e4c8fea6196609e91f25f393c734beee945fce19ee1e486604b4
font_03_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 4352 bytes
SHA-256: 11c9f32e78a8bb2eb20c2607a6cefbf9dfce7c43dc77edf668ec6b42e99b1b85

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