Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc031a83b522bd0…

MALICIOUS

PDF

94.2 KB Created: 2021-06-28 14:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bfa3ed1e4de08266111b0d5aea3e02e7 SHA-1: b51f3718515aa8560c23a3716e84b4cf58751e0f SHA-256: cdc031a83b522bd02b2cef368d65187ed448ad4e6178da5b74eed2dc98bdf27b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The presence of JavaScript suggests it may be used to redirect users or execute further malicious actions, while the link farm structure indicates an attempt to manipulate search results or distribute malicious content. The file's structure and content align with phishing or SEO-based malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1d4ee5ad---16727996167.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2d76013b41026e9e00ab5a2e9b0186ce/vatemojerikadaxeki.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609814bd2509f---83500650281.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbf8cd084---xifigifalanarejenigaf.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/dazekuluzuwomobizumi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2fb071b417e9779139f2cc1329f8980e/sajisesibipuwabu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/48f3c8145565a3109c04e1218fcc6e93/20575169526.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ekc6bcaeo8quos162m4fh2ifg1/ridevukutuwo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/342d40a6174fd31e2b88bc13c042962f/lusebegowolaxabano.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d1m85bm157tgngg2aime95bsp0/golepasuwifoniv.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/11946393739.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd603ad1e9---lazozofenawuwovat.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/93bdc22d54533530af672e5cd122f943/56472221681.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1348b5bae1---nesowojuj.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b247b12e48a---90330013045.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160817e6acfde5---27184194863.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fed842e16838431ca8898340200e9789/36865469976.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/gavuwesan.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/3055331947.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia7ik3ofs02q35evjuj254oqaj/gasoguvuxi.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/xofarerisavirusobuxukobu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/evk8hbs30g59gr63k64jjvgr53/judama.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/edtc3h080b64csfih8bmchetv7/16104458756.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9c3a1af9e660167b81196414426609d7/48944457708.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/lefulekegan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+hack+ml+mapPDF 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_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 10212 bytes
SHA-256: 1434d71eb94e65ccf87a90d1816b8a9314d2d3c59a7fb7ebedeebd56b0f6cebb
font_01_sfnt_off0001251a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 17732 bytes
SHA-256: 2655c4ab797495385c9b85b83de6f3469387923bc9f7018d466bd2d9670ee6f3

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