Malicious PDF — malware analysis report

Static analysis result for SHA-256 027a885f32a07df0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 16:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76e0218e61b6bdf13b39ee17a4b88e0b SHA-1: 3660348484e7b7942fca8be6c5e273e0740e31c9 SHA-256: 027a885f32a07df04ae5d5e9bb9fc2a4fa932a8c91921ea6ca21337e2afba7b0
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://pensionpoint.cz/userfiles/files/togugarejekebiraxeti.pdf In PDF document text
    • http://fredericjean.net/oplusco/file/setozezekanejugitaxi.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/kibux.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/53924757794.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/563c23f9815f4edb19e529fe7e7d9a72/zedovibamefamigagujokone.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/xonelixuxulezuzubowamag.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gakeguwisulifisi.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/59796312273.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/mejifatibenaxutijirogi.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/27823680151.pdfIn PDF document text
    • http://skolky.info/foto/images/file/tisas.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/zujukawizogafevef.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373152bd5ac---jevedop.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/tupalikodigotojekexima.pdfIn PDF document text
    • http://mobilenmr.com/files/files/remefawale.pdfIn PDF document text
    • http://geotersrl.it/file/nasonazuxeridepotumi.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/kevadonaxofobuwilisasaber.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/870667fadead3b602b54385ee6456ae4/volum.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8d2aeb28dc3b32394a5763c83ec4d895/sexoxerimuz.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/vozokininegagezafefumuge.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/9890401364.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/busomupoxobibalexi.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/nesetikojotezi.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/rugolularep.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/pizura.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/28747582276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kodi+mx+playerPDF 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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 18612 bytes
SHA-256: 3b4c5332378dad6af7bc08dbb2745caac686827904a5ae715c28aeb7b76a07b7
font_01_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 10392 bytes
SHA-256: fad789ca6144458f561978772be5e4834df69589be1b15fd8e4282566fb1a166
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1