Malicious PDF — malware analysis report

Static analysis result for SHA-256 2444444009e6a04a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 02:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00fa18fce176f56664b4edd271789a0f SHA-1: 6cd2b139f59fefde3f223662ad6773c6b95003af SHA-256: 2444444009e6a04a328a01619e0d3e39f40a5bbe244dee99f8f6d937c14acaef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdc1d15d1---jemijizamekababajux.pdf In PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/mokak.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/xawesinopovuvifupukiz.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/1opou1tvcoj2ut8lffbk0va08d/dutuvotumiwaguxowonifil.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tajetiwewiwadidiru.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/rapowekufoziwojeletubaxo.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/wetew.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6fbc42aa96fa56a3ee61e76d3fa79a4/71406123259.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e355d85e34---33938920627.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99f615f2c---mubatexesozukisuluwejofo.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/tixijerigakawijadoli.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/dc253d89fa4ddeb128674b6ec74777d4/23747819686.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/10794985698.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109021222042257.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e8808549dc0---38215565495.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/pivavowe.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b66919ee---73107078381.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/49475427125.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/8leg4f8ccias7v1dsbglhvpu6j/refijowojowuduludazo.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/dediviwakoxisixuj.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6572fa7097---69772838762.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/210da5cf9164f54fb4cf51b0bc213cd5/83420190041.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf26193a11---javokebupidivipogivub.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/maguvamejamanofusidupaze.pdfIn PDF document text
    • https://koratspring.com/upload/file/salobuxegudemagakiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fifth+grade+math+worksheets+multiplicationPDF 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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 11324 bytes
SHA-256: d3b5b042cfd40e37581e445f5bb895832c832f18b5b96d747ead0e051544380d
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 17660 bytes
SHA-256: 643bf2e64166a672ed0e35a40a807a6c97ec7857f76ca29994a51783ae85aa59

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