Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98b744e3079319a…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 22:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 50122e95ff1496d16cace4eea3659106 SHA-1: d2ddfdd7d65de85bce6f75859a6178499cb8ee53 SHA-256: b98b744e3079319a0b5f6461f280ec3ddd457a2d766da261e0d705ffda0821a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links pointing to various domains, many of which appear to be disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/muwig.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bbk7iu822gedq1hbc6kgc13lp7/62677431369.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/mabife.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/34013921195.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vapumijefid.pdfIn PDF document text
    • https://insp.biz/img/file/55099194128.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/22830291509.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/1347108322.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cvmd5kq247i9rtmk6fts1st1bl/41159351462.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/42341028806.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161409ba4ed7c7---26149456540.pdfIn PDF document text
    • http://feminella.ro/upload/fck/joruxidel.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/98036532680.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630508545/files/gesafivimupokojunulobedul.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/27174190341.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139711920de5---32987334070.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/tabepagigaxufafakoraziman.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/16845226205.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/5795495668.pdfIn PDF document text
    • https://eetravel.net/file/1650777390.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/81169678973.pdfIn PDF document text
    • http://zkpower.net/upload/files/dalezotaparusejejewefinab.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lasoretuzonuzomodem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+one+piece+androidPDF 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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10328 bytes
SHA-256: f37d4c11b4cdf8f09c1ac6c4c8782e50c149ced5a093591eb27004329e59bb79
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 14460 bytes
SHA-256: 615ef2e0b132c3f08058c062fdae8fd37e5d9ccc756b0d012d2f7189ee1a9fe1
font_02_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1