Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7e0e99c39b196b…

MALICIOUS

PDF

93.4 KB Created: 2021-09-05 15:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ab45ace67c4d56c606ab8c29a78a2d7 SHA-1: fc3ee29ed90cd6c765b5fc8fafbae0925c01d514 SHA-256: ea7e0e99c39b196bac71a1b40d98608ab9d1d94979a3904f3bcd1a17462448c1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://archism.ru/uplcv?utm_term=la+cantatrice+calva+testo+pdf PDF link annotation
    • http://vankouwenenmastop.nl/UserFiles/file/20551812895.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/xamubabur.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/12d860049aa42ec78085d844213bd98c/vabedorozasojizisitaz.pdfIn PDF document text
    • https://aneri12.cz/res/file/18813279613.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/wakalutibobotane.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/tusufag.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fovubisozejotegizapatipa.pdfIn PDF document text
    • https://citytrafik.nu/images/file/gokolob.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/notitedalewezovorugo.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/5128250612.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/51348144405.pdfIn PDF document text
    • http://futboltotal.net/images/files/94053148084.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/miraxolokoxidi.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/56e2a5f3f4b4378583b603151eae2309/64652898386.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4170512d26---zufejodex.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/redurevu.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ee5d52c859a34288f491cbe5a09048c7/futafato.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/gurusimapigesoroxet.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/978fbb58b27eab6070faa1ce92eb4dc4/36749891901.pdfIn PDF document text
    • http://halaljones.com/uploads/files/9968305456.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/331c02011b7511681227340c89d412cc/jawosevojufaf.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c98f0941d---10018009804.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/kidax.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/97875050652.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/11252989537.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105533c04cf6---gekotosegafef.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_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 17652 bytes
SHA-256: ebe47c8492529db5df278d7cc35b6ef680eea7922b93b837098a93cdc845479c
font_01_sfnt_off00013718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2F 10636 bytes
SHA-256: 390aff60f96420440fd95195ba094a1f175011c8e192378d8e6d832c6da3101f