Malicious PDF — malware analysis report

Static analysis result for SHA-256 772c85c52fd1e3aa…

MALICIOUS

PDF

86.8 KB Created: 2021-07-02 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: da254fa6a03addff57846cdb138ffbc3 SHA-1: b2997438489b49a0ae0a4a511ee6c9f4ca29d26f SHA-256: 772c85c52fd1e3aa5d8db7f28273e90df6375769ab9e036bce67df6c2cc0c79d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm for SEO poisoning or phishing. The primary malicious URL identified is http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce84b6be6c---51687679796.pdf, which is likely used to host or redirect to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/0a0f7394d697e2b9c0c259fa72b544e3/jujigulapiziniwuvixoduvo.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m8a9j61elpghdfbqrmb0elpbb7/fuzelivukep.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fuk4ti4kv2e9hnve7isksv71r5/68664334605.pdfIn PDF document text
    • http://roocenter.ru/upload/file/xepinolizuw.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce84b6be6c---51687679796.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/gekudowebulune.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085723c8cfb0---68321243855.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/99218838427.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/wopusitemikixa.pdfIn PDF document text
    • http://salkim.com/userfiles/file/lubewibudevumipazorido.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7ec02157aee153d6b8b1851d00952577/sisakedu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5739toim30h58tdvm5ker2qbiq/mudedod.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3575d23ccece49335151dbc3dead05f6/baxibumoxijed.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/44d53db4bafcde7a50fe30930c73f75e/xurezox.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/87782185956.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/eb2239c548a8da087cd8ba6e7003e724/pikide.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/11394756742.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4ot5v1fljns3ifqava2fria132/dutelit.pdfIn PDF document text
    • http://kaies.cn/upfiles/210619012144217466tzxz18.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=private+hydrotherapy+near+mePDF 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_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 10624 bytes
SHA-256: d9ebf2c3d860a6f40e8707e0332698e9429c4df0d191db2df4c02ba63fc3257d
font_01_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 17856 bytes
SHA-256: e8d79507d6966228fcf3839eef15694d6488f8d8521879dcde4b061d116a805f

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