Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e83ddd2927e8d9a…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 11:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1494b7f19693a9769a6d92dd05df2cd2 SHA-1: db22722d5a4123b7e8ac4973d7d108eedb1251c0 SHA-256: 4e83ddd2927e8d9a83b16989d3da16bc18b5997c45a86c58ca9b7a3233b63379
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qcsqb4g0fb4c5t2s8ebv3b4m4f/9038881824.pdf In PDF document text
    • https://ksboutlet.com/file/files/67471298118.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5e27d215b59a89bf3e5e95b90737ae6c/jewek.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160846f5e15141---70339967665.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f4e5e108---babifogevevewe.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/vunejubonakibijigukisura.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7beac0384e---16767130403.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210529190456.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4a9813b785ef1e17e4f772fe72a3da9f/93407248208.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/29374908656.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4d8d7de93579dcdf2085eaf4935d1489/31032936974.pdfIn PDF document text
    • http://adveotec.com/img/file/4208331911.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc30c6bd4---bunize.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748370d3ff2---kolirokozus.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/56b109e2ebe71a54bec1ca6dfac562d8/wuwukujogifiliwurewi.pdfIn PDF document text
    • http://envigest.cz/upload/file/xupubumig.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/dukazuterobetixorulisi.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a760a641a8eca7566105442f2c25cedf/zifokonagabunapesetiz.pdfIn PDF document text
    • https://senhewood.com/d/files/69904988553.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/952f67297e70dfa243c9a77856f92e3b/kavato.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/ca422e4dc3f26bbe4eceff99bedfdc14/gawidojiwikigugubujibuxid.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/rovavafeguwafaziv.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daabdab7a3---44078255050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=belly+dance+is+from+which+countryPDF 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_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 11096 bytes
SHA-256: e2536f2105f611deb1b653a0b11f97589d80ddc14da9d964354c6acde24f34ae
font_01_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 18020 bytes
SHA-256: b77a5a2c5f958773c2523d3284182c2167beb4c90455bb91f8608f13ce63c9fa

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