Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e49df2a65b92c29…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 14:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7f85ee445011106f27a9fc4bd774c39 SHA-1: 715422ab4256bbb29a74b97df1957d01099a525b SHA-256: 1e49df2a65b92c29697e7f0f94670b8fb87c02b327e6d6210c18f8c2ba2ed5cd
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 sites. This suggests the document is being used as a link farm, likely for SEO poisoning or to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=wiring+diagram+manual+airbus PDF link annotation
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160783269bd39e---16934602856.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/37897883488.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/momisejijarovib.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e94acede---gosotixokulelixovur.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/546fc787f8c173df95033bdc4264fee6/fexavuninilisemadabekexi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4b01387e269bd76ffd25b091ff96f9d9/90596100339.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/17290622049.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/54525661466.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc9d58d01---3003138558.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/sarebakepaxivowonixalezu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac100a3b75---mutevimuwagosowiri.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/69901241803.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6ead1d08e5d8d442384bdaaa15fe3f88/33977401446.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/cb477881a2b1543e19cf81686ff2096d/50672475113.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba2ea488e---25552522516.pdfIn PDF document text
    • https://banghenails.com/upload/file/69059756585.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210705043521.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/57218366497.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9fd1ajrd06ng76trmp0t1l5end/sasolejopav.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/wobajikemapiz.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/tesivorodu.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/79509393645.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/mivonaxixubexukoje.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/lemagilewolasezif.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_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 17728 bytes
SHA-256: a92188ee50be2e4b62f7d0f65e0be4dcf4dd6f133823540293430f959c9e3809
font_01_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001405b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405B 10476 bytes
SHA-256: 7e7e6f3e29b24a21e415a03d0540cb1d1762a9efd95f048cc5a44699d2996c85

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