Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ef29db9062f6ac…

MALICIOUS

PDF

93.6 KB Created: 2021-09-08 09:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 064731f7cdf9a5739a6696059fe12f43 SHA-1: f7ec6c08e7eb52d20db636ba0737beb976b5be51 SHA-256: 87ef29db9062f6ac707d02ac25d52206c78e8723ee492843861b2f0c75749afd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs, many of which point to compromised WordPress installations acting as link farms. The ML classifier strongly indicated maliciousness, and the presence of multiple links to disposable hosting suggests a campaign to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b1fc1cf5---dawosezowuwumitumilidutu.pdf In PDF document text
    • https://dptech.vn/uploads/files/42044048968.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/78783217301.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aadd33cad29---bibunigukoje.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d8eab877d---negebebu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430050436811174.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/4022768263.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/ae63925789434493c73983ccf38b7411/rolatodipozo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0b52af052d1d84f17e2a659e4b0336fe/wafosiwoxoxetatofo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091f99ecfc42---44127885709.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/11221020283.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/kiwuwexami.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada6116fcc2---54096633518.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/21506301007.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/98671388649.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ginegamigulofu.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/84172847079.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55182672050.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb24d747b6e---jonosaf.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d1e9e9b18d831eed13bc09ee2a5216ea/tefukivora.pdfIn PDF document text
    • https://sinarwaja.com/account/files/13733709821.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc8577393---33014599594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=anomalias+congenitas+renales+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0126810e2964d12b79785728a291d39d/duroradilokixuwejopofup.pdfIn PDF document text
    • 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_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 10944 bytes
SHA-256: bdae72c47328d2ecde0604aca16daa5a251cd81ee9d036988edf2de06b8539df
font_02_sfnt_off00012eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB1 22616 bytes
SHA-256: f240038451d13cca61a5c8abb87514313f95af41f1e788af8719c1892a48df86

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