Malicious PDF — malware analysis report

Static analysis result for SHA-256 c151142f2e1fe7a6…

MALICIOUS

PDF

82.0 KB Created: 2021-07-21 08:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 581c52c914ac1adf2e622e876580c5af SHA-1: cfc20f6e8c9104c802fadff3c6024babca2ce67c SHA-256: c151142f2e1fe7a612edf375a95c0a90ba61f34484d69c6105c41d2a5f0e44cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests it is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f5094b15f787ba4db8d2c2da4f666d0d/texofesipukibabad.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa2266a256---10527285481.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/miles.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9f33412e162f9ed8878768e2262faaf1/dukujirexubufotelu.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/paviwosunubop.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/futaguparasok.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c1651f9e---82605781844.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6ab0f1f480eb8c8c090916f227a0d39/67424754022.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/78307527325.pdfIn PDF document text
    • http://fygl.net/uploads/file/20223643189.pdfIn PDF document text
    • https://preciseenergygroup.com/media/96239501908.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f8ccbe1a4f6331cbd7a9a89d6e67f74f/36125343884.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/42294598760b0c6718be8e.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ireer9jnihud59kan83ipenft1/34397018469.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725e49e98b0---bekefuge.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/botibugulanasapuwevizuker.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vuwumuwevidesifu.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/satiguvamitobod.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/mamapawubizutenaxo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d9754545282e85925966e345d408ab55/bowolizox.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ffcb5e60---bavajiduzubixadogiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=device+used+to+measure+windPDF 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 17128 bytes
SHA-256: 3e4a9263c4b2ce9ccd0723af1f710ea88ca9b8b219ba70f1566b5340b9090dd7
font_02_sfnt_off00012238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 10736 bytes
SHA-256: dc0cc516904feaeadd93e756c2f0cc4ca779c7bd2159ef714a8536b3185412ce