Malicious PDF — malware analysis report

Static analysis result for SHA-256 8009d736051da99a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 16:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 854d58c6b554b06e9acfc36052897dec SHA-1: afe8cab00db92d3df8c5f1044fdc9e1ae91eb11f SHA-256: 8009d736051da99ab7364f25269135145e96ee55586ba16f50093492a6afdcb9
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary function appears to be directing users to these external sites, likely for phishing or to serve additional malware, rather than containing executable content directly within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://grafitym.kz/files/file/5899141024.pdf In PDF document text
    • http://ore-processing.ru/d/files/biginivekajozo.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/xebimisemiwizimojoxubijik.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/19476918407.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/16707827618.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/550af5ace587b3ea3c2dd7889d5b20bd/98759160.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c6dd8b81375fa21b0fcaff1769281605/baporeg.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/gexodasurusunog.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/45545582388.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovr08j4i1k4pg8ndjtueuhtbv4/21899779644.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/32697371972.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99e931898---65495927243.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134196bab455---81434415537.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nomizi.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/xumeju.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/goriduritogupu.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/gokewazuzomubutop.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/03a28a91e47bfaaaf56fe1745ea01ad2/44521634426.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/naroridi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161451dba65f1c---vofebubed.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/6791994041.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/32605548829.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161336aa3acc30---57338549258.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/71044441331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=climate+graph+worksheetPDF 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_off0000c780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC780 10804 bytes
SHA-256: 967b8fcdb0537eb574b68ecebebb03a3da2d4811be427fd6ad5495ee0e9333dc
font_01_sfnt_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 17624 bytes
SHA-256: 0aa50717a643af64a2275782f8b3148aa45e235580b8f1d1cf45641071460e0b
font_02_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1