Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8e30b2ce514159…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 00:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61d7f2405ca5fbb6d42099c9d13698be SHA-1: a8024b7271c11b341062b2dced1cc8486f8d0391 SHA-256: 9e8e30b2ce5141593384785faf624249c834e26a4a0e75af1fcd31398463a538
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and compromised CMS upload links supports a phishing or malware distribution attack pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://quaint-house.com/jepuxuwalenegawojujapela.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09cfe9f34---nafidiz.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/4814858357.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/jogebumidonasotawimu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a108786d00f---jidetejiwal.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/retunemotilin.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/nupuxuwovo.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/jodusavig.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/mameramizagonugiwabudasa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070532375a17---28172935171.pdfIn PDF document text
    • https://melz-feu.ru/upload/kufileg.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1e8aad898---67071660193.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/lerotajuneronexe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da340dc1fc---17982755364.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/67421131409.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/30613720712.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/ronas.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210721_2BEF15C006AA541D.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/60269370354.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/walakolotefudunefi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8611a3462837123e60a2a1594646c575/jozolukamigivukatanuwaxu.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/xilul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=nightmare+zone+melee+guidePDF 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_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 10664 bytes
SHA-256: df7c9f7e083fe1a2f88f823505000824666dfe67931d040c6f5465292c27b6e1
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 16920 bytes
SHA-256: 621d743b10f76b4dd25fe4b78b79b65c014ad6db93bbdce531da912213d3c409