Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f11aa29334f301…

MALICIOUS

PDF

84.3 KB Created: 2021-08-13 01:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d2138a3e9702a9415578d3558540d40 SHA-1: 61ab313d616cdc3f442af99c55cd609cfaee70e4 SHA-256: c0f11aa29334f301686267e160e79b385c8f9d33de0e06059db1610d704d6d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or credential harvesting campaign. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=vmware+workstation+15.1+crack', are designed to lure users by impersonating software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://chcial.ru/uplcv?utm_term=vmware+workstation+15.1+crack PDF link annotation
    • http://asude.istanbul/ck_images/files/3365719762.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215111028409187.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4f49b605b---tovutawagewopawusog.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/dikexijino.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/44176110309.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff5bc7eb453b277610d7013d8cd31e85/tetiripewu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609edba32a360---49146023039.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceff13f03d---dinikazexiruvuzobisa.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/kizosurabibimef.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/95419936702.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/57708707832.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4lcar2cf9lnq14ev2uh37f4ea7/papilikeronexoduxof.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/birowadot.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/13252315132.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/fe77918b41174ff11945db54c3ed8796/zesatawikemulad.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/53251711207.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/nezodosa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0349531962---baxizemugu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c850e0aea78---karolugubisofebakanigu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608664f884e54---54866884453.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/88345ba1fec67bae5d9dc255c4c531ef/23266794321.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/zoxijimoninipavokotiz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqeaou98mkkqqkte3p0l60i3bm/kuxalu.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/1e3ea1afbbf3a2361c0a2615ba224342/47629607417.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_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 16836 bytes
SHA-256: 0eedc87ac681838b894a4ea7b2a7dc03db6326211cc3f4d02545d33fadea0bc5
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 10744 bytes
SHA-256: e3ce46b6b54d66f652b7b8a5b782095b7ea29790ec4c12ab370237878c30e31b

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