Malicious PDF — malware analysis report

Static analysis result for SHA-256 904993800db7c972…

MALICIOUS

PDF

88.7 KB Created: 2021-07-29 20:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4571749fb419aca291b2c9f403b3a9e7 SHA-1: df5ddbe86534b2ca27a5237e536f692837214152 SHA-256: 904993800db7c97206c48a32ade56fb553cfc80f92360543fe744ea8b58e8756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload directories, suggesting an attempt to disguise malicious content. The ML classifier also strongly indicated maliciousness.

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://drafthe.ru/uplcv?utm_term=waldorf+bunting+doll+pattern+free PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081716322293---65347468024.pdfIn PDF document text
    • http://pneusmarene.it/images/file/25794361686.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/zojexitakudafized.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867649ba1a3---99865405219.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161001f0c9506a---fobopudozomev.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/250b73151076111ccdbb1c66dfc2a008/95847847693.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210609140646.pdfIn PDF document text
    • https://alpinashop.bg/files/laruvav.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/57ad2ced5cee55091dc272e5474e4580/zaxemuletup.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/r4k0ock3v73me9qeesvm8pl075/47938015919.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/aaaf3a4966cba211927a1a7cba2f6ee7/rifezovom.pdfIn PDF document text
    • https://yuss.it/file/rejojusuvetefisexem.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/273926427.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184e629dae---lujizajesigerok.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/iv16pelsr0j32ickaefono0vc0/77808390882.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/sizuk.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/1rg2ut8qk6eellv8ovfif4v0ib/zijudem.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081474a147fb---wejitixowuraxu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/n1ciophpun43k8tqj6il2t0via/81398990064.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0ec2bed8---89133005654.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/50467630970.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8fde3c17402608f04484f216ae227c92/1516501031.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084565c7c580---ziloxifagiwamelopijugodu.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_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 10736 bytes
SHA-256: 5c9a788b916de64d49fcd77614f77efd9d90980a3dab0597f05870de4eabaa16
font_01_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17064 bytes
SHA-256: 0805829292479a4fc367d33a9e2e3b4d396c457bdc7fbaa12207b6ab431f9d5f
font_02_sfnt_off00013b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1