Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da13ff1d505955a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 07:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e0b79dff0e03c61f637408f003551dc SHA-1: f87f12f4532aed644b48f83091373c94362f6594 SHA-256: 1da13ff1d505955a21ffce463e316b28f9ed99f09a4e16b955d53c22a75aa416
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21f9ac9c4---sofupejusawudelu.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fb8ijgfk9cl9m6dofhivv6pp0l/49548144680.pdfIn PDF document text
    • http://hasyo.net/files/file/14178326282.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/wirisujesofebazugaz.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/sulafuvaf.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/femob.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/vugaxik.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zazenivunuloj.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/tewuwexegupuxuvives.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dba41460e1---29331107148.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/78201569150.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/subisanogubuwenunefazusa.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928b2b3b844---58974068628.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e0a40d06c26f940e48d0ae63845ab2a2/moxovilipowonubixemipox.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089e308aa0b0---lukeforuvaguwurisowel.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5313f913143d3b6c78d5bf129d342dca/32332240722.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4ef55b6c---kabuwoxifebazunutemapabav.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/19228407193.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c032b87f1c8---bikezoteso.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733f9798961---xapavejinekanidumupovad.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caf7a045672---11821970867.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ac59366d---22538216971.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/23213146770.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/j38qaakhk796261eccvg894fvu/28763528578.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7247731854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=federal+overtime+lawPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6204376e8b8b6956c66601fbfb6e6e9e/26439856275.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_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 10268 bytes
SHA-256: 903e0a66721d1cb9306cc064991100e5844a017f8117765abacd12b7fa8980c8
font_01_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 17072 bytes
SHA-256: 0e4e7eae29b2bbd833dbe0c68ea6b1054cdb32c5db8dc22ce97298e1a225a99b
font_02_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1