Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a967ba9dafb92b…

MALICIOUS

PDF

92.6 KB Created: 2021-09-19 20:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4e53b225d51abb106bb6f570a692592 SHA-1: 177e78b54f15f158e6150dbd60ab782753d337c1 SHA-256: 92a967ba9dafb92b1d59a36e1fd6c945aab53b23ccdbe76438f12589c0f4b722
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or domains associated with link farms. The ML classifier strongly indicates maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://smidgel.ru/uplcv?utm_term=best+onscreen+keyboard+for+android PDF link annotation
    • http://nicolalazzarotto.com/userfiles/files/99451098438.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091807182673499.pdfIn PDF document text
    • https://laps.pl/userfiles/file/jalafaxesexutegiriwimera.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/76871388133.pdfIn PDF document text
    • https://baglab.pl/galeria/file/wowonumugosifajevusisax.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/72910540635.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/bexesivotagabevagari.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0910f6b8---90962594361.pdfIn PDF document text
    • https://scalping.ir/data/files/file/52521874024.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d02b43cb0---tanojaxaminoladozenopag.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/vebevisatizemezelid.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/96389546257.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/gebetugoxexijofetedikawu.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/jafiritadirej.pdfIn PDF document text
    • http://pasted-radio.de/web/files/rerinelifafupasu.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/71055582855.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/73322116921.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jekibiwi.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/67099396036.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tefelitekovoxedujonofivuw.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613483320d7a3---12652739841.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b4dmdsh3fs50rehi84sbb7cnkb/70737427960.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/62279684434.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/xinelipisixex.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_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 10820 bytes
SHA-256: 59e41d32fcab0fd577a9f67a1278f77f8a105e7fbb4e161b5cf1b780a309f4ca
font_02_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 19644 bytes
SHA-256: 2a95a16852a6a3118e478f53ec87171646caf30b361039b65dbefebd3456fa1c