Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c951f3185d1957…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 17:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95b12bdb4c1b2a09013e4cee4da230ca SHA-1: 88cc037d36345a0db07dd5a36eb1bdfb8a8d289d SHA-256: 71c951f3185d19572cc703706e1e5d2ba987c2e67c503287b8282fba7303878f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ML classifier strongly indicated maliciousness, and the presence of numerous external links on disposable or compromised hosting supports this assessment. No scripts were extracted, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://badoza.net/userfiles/file/64895360298.pdf In PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bba6aa727107bae868f1b170ed8d7049/88864680143.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/53468343793.pdfIn PDF document text
    • http://limoride.net/gallery/file/zibanapadoruzulovoku.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e9fa0c1165a4e05a471108322fcffd37/mumasoxukojarifepabe.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c1df00dd---42744165046.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/026b25337661c654551ff62b4cd90251/3945019519.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p38sglri2qjb8n40vjocnoep49/dajamefusojojiwudavaxemik.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6cf362b10---52215168605.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da21bd5cce---91412007994.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/91v2pqmscvb7n3i6kcob8vv24g/zojidowozav.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7e2f97f387429759079bbcf67ca9e066/masugazuf.pdfIn PDF document text
    • https://buka.ru/sadm_files/geporus.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/demipozumiw.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/39394459143.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qif2eed02kavb4ca8q0mfaatqt/77404777926.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf53a45287---xigogabatikidalofogip.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/jugotop.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/74175769873.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/53348016809.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210719124210_6wzi8l.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da739db82f6---kutuxefumevusijaluden.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mvg74msr735bc3pilqsejomhu3/81051313684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=haynes+carburetor+manual+free+downloadPDF 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_off0000c1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BB 17916 bytes
SHA-256: e2dae2d4818534b1febf60dddc798954c53c3458e24ca2c0f17331677fe4c9bd
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 10976 bytes
SHA-256: 947efce0245e145a455fbe84c36e0d60b7bcd385f88ccdb39e61554d6fa5910d
font_02_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1