Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed5e287a9bf656a…

MALICIOUS

PDF

91.1 KB Created: 2021-07-08 03:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d031ddd509cc99ab375d34cc307ae3d SHA-1: 2f388f9367f1a9671e760eb1f1ad3803dd1cebda SHA-256: 4ed5e287a9bf656af7166b4c8d14e79e42cd90e8eb38cd848b64b3b4eb8cc9ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/nors16luh3qabec028gm6ikog7/98190447207.pdf In PDF document text
    • http://www.radio-kum.si/data/files/xusavofowuzakinezoku.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/72e51372e4a95193482f8eb9d8827ff3/keromutiwenaxuporevux.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/87745557215.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/65978078767.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609254c22538f---35338599036.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f465d30daf---64013370740.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f87b1bcc---fotusivaxuxig.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0b1d1602---gatupovumitiputerude.pdfIn PDF document text
    • https://avenue102.com/uploads/file/72744193247.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/fewapitagibovuzajetagawef.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5af2ccff0502677f6bb44d54685277d5/55072694906.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826798cf8d5---54246125782.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6d8dd57e9f440e0086ea52de65f71822/47557626052.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/xurudezib.pdfIn PDF document text
    • https://paperland.bg/uploads/file/wotid.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/8745651909.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4ad56131df91c758c54425562fb79068/zositilovif.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f47ac7916706c3e4f6f0af872b940281/gonamitota.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/776c9216f772512258fd57afdefff9c8/kepesutobikijuxagapot.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jjirvcq9nthllb7d281rrtbd7h/bazifuravibi.pdfIn PDF document text
    • https://la-klamm.org/Files/files/66979107348.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609014957aeb9---kikofoduxepajilel.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/703cba0f010d45a3ac9d0d6537fd9e58/3948911738.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nno4qqm2ad8895ajvnb5ajbmp6/59828802176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=words+starting+in+lPDF 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_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10284 bytes
SHA-256: 1e3a71609b7e4c66b91608968dcd41eda1f25f80c33643c634ac30c848e6ec24
font_01_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 16880 bytes
SHA-256: 53d401a983d957c39c4662d47efda7a3f48b4259cb93e9b77d56e8125b11596d
font_02_sfnt_off00014603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1