Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee5f80a7b77042c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-06 03:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c1e7efb9298283ba56da5e2375e5900 SHA-1: 5a4da5d76e0e1b1ef271f4daf9df2f032bf474a0 SHA-256: 6ee5f80a7b77042cf630a888f64d90c9df40af2c1a3efc353e5af0f8a9112570
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, specifically targeting WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier strongly flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest a phishing or scam attempt to lure users into downloading further malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca37ebbeb9---22220850715.pdf In PDF document text
    • https://mimpi1pusat.com/contents//files/zifivuminelaroz.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zegafinorefovo.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/30965868616.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c4cc6d0a0bec8b1c639e4fdb33ea431f/18744200381.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba5a9b1da5050326143d746b2a0882f2/10582949824.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/toberi.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tikolomogu.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5ee1a11c25db941c6fe1507addd8c00b/80753116925.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7ffa96e746b144f2fd5289d1abdec5e1/jamiwugo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb0c08e3---xozipoj.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/fagonazaxagekixisox.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e4144aed6---42667262860.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/vowujepagugawujegulexata.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/gld3a21vpb0tg9qal42cumglig/bamizuperasizuniloj.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/d5939362ac74df351fa856f7a1079e13/wusibefudagitivugamov.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/sepiri.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/83730655158.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b609ce3b2---11591677658.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/bixojigedexop.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/86471720654.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/23884703501.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/rebato.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/biruwiroradukib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hindustan+newspaper+patna+pdf+downloadPDF 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_off0000c857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 10668 bytes
SHA-256: cfd102737c7cac856927058c478ed2249cd140146c36686633b8bf6f8183fa71
font_02_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 20532 bytes
SHA-256: 81c4f3cafb6a902506e0c4704bfad5bb1b188e900f4eb0234e091c2abb664ec8