Malicious PDF — malware analysis report

Static analysis result for SHA-256 2480d7fc8814c420…

MALICIOUS

PDF

93.6 KB Created: 2021-06-25 15:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d866d0ed7ae3b28591ccac9815bcd2a1 SHA-1: 207567380a1ff8cd70462902cc32c5d648359713 SHA-256: 2480d7fc8814c420112011f2894795ee036b7d24d29b7fdf6e245e177dbc2357
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings suggest an attempt to redirect users to malicious or compromised websites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/31vm394o5pq4j4pugrj8ani5et/wesobavisigose.pdf
    • http://jhdljz.com/userfiles/file/1624577297.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/82851185a642b7eb612e776104dc10ce/lupati.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee7f5434f---89949684374.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cccefcffc8---mobegafewijo.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa31029d6---66077671138.pdf
    • https://eucolait.eu/userfiles/files/89015479060.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/eeb0328fa239306fab0f2961fdd80b69/timuvunopime.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4479b738237d016139bd4dc678822785/nizirenal.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d697c6c120---50531087741.pdf
    • http://strandedtattoo.net/file/gizopok.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/4e0dcea9fba99c4ad071b0cdc9dacb5c/9724369296.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8b8f2e1187b0618f253edc1f909b175a/fizake.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/iagn3ip8fcjh6446tlmhu80ver/podupokamuku.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=accounting+for+absorption+is+governed+by+which+accounting+standard
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 16792 bytes
font_01_sfnt_off000120df.bin
8d19cae6d6a8f8d5075a5647cf2680a9ffe8279272a85d74454d0aabe444e91d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 17392 bytes
font_02_sfnt_off00014e9a.bin
06030221b3098924d9188ce6553e6e94f7c4a58fe30a66680a26f7e59d2e8292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9A 11340 bytes

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