Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c5406605583150…

MALICIOUS

PDF

108.6 KB Created: 2021-07-25 23:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74b7aadb0cb68fbc13e5842e44c93bbc SHA-1: 745324363ff29a199c27e777484b0eee0e57fc51 SHA-256: c1c54066055831507d12e2a5315c8610e47ca87a973c24c36ddf0fb3d9308d08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cottingham-group.com/cufiles/files/55084213419.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/58024cef42cb9e93774a6cc4813595c6/9996459942.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd63812259---vadikofovosa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823d805c5e7---39339266658.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210623215904830.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856cc68df68---pesoreruwuz.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/majepufobavusarixaxim.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae044ecfb52---labatedovifawabezopi.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/xibanuram.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c8a9bd101ccda438a1d2799c8ff14771/51732032860.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/48864fccfc973b49b3c86d30685fd70e/govilabeditadof.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/24366554247.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/33193478079.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/goxoropejumunolevawimugav.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/gujanarosogafixefenutudo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e0a510a8---xenogumexasejaga.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d62ccdd7437---wikosowutodidurebajasa.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/28904527018.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8e2ea7a9967f0d4e2fe5becd979ca350/kuvikuxonulewibudixu.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/84519436838.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1861c2d9c44a6a9f387e9cb435843e05/kuwotononavifugofaf.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/12063632176.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44eeb252a3---47244252777.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/jetiton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=madame+bovary+r%C3%A9sum%C3%A9+court+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/707d4a16abeaf7e404105271845d0d15/zevosi.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_off00014156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14156 19104 bytes
SHA-256: 645f7aa37f1abaa1a5c87a0554708343f2f5eb5149cf52d0d465f87a7a3b45e3
font_01_sfnt_off0001701d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701D 11104 bytes
SHA-256: b5991243a15b9952f54d58ce357072ab6fd1d64cddae6b0611cc35c8185f82d7
font_02_sfnt_off0001899f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1899F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1