Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e36f2e8e6545394…

MALICIOUS

PDF

75.7 KB Created: 2021-08-31 12:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09b3b742c91d594e93005bb8f4ee3b12 SHA-1: a8f50fa1653e9c7d8cf919da7206385320c22d9c SHA-256: 3e36f2e8e6545394e37ed478b3a97a8aaf0fa3d0a172ce7ba370843b37ba130a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or directing users to potentially malicious content, aligning with phishing or scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=biodiesel+production+from+waste+cooking+oil PDF link annotation
    • https://hyosung-gulf.com/uploads/file/76927179071.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/tk3tmbihctu6e888qdv2jmeqn4/pazukuxosa.pdfIn PDF document text
    • http://coumert.com/images/file/pukejimenuke.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/wudagerofevus.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/96550787238.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/pu10k1l0jl8500c6g2gst6u95m/56058305634.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079436f062a5---divotakagorokirenov.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/jarerotig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b2975491---89054699079.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pagm3r5665ukbtese4ui7mb2cj/51458757444.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/lowilari.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/bovesibuxixi.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/42634473223.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pipumepumavisipabevug.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/7160974469.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/3chlq9ar8eq2kc5k0dr3o0ufcb/pebijitufitoku.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/db02126ac8bb55983dfb161f32d89acc/4489172413.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/97349576485.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094601c31db1---woxezivunowubur.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/ligekubu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9779f74ab2---29571698456.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/78965944421.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_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 11292 bytes
SHA-256: 0c5c90590f8e3b0d017c7c58e25d5a4515c0149ef18998116146b848500d1eee
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16812 bytes
SHA-256: ebc99c8d59f472b7268a43c7fba3b21c472ffb23c9bd3bfe577e028face5a98a
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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