Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf033cff328aaee1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 04:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 354b9642a1609e770e06dcf5c765dca8 SHA-1: e3709648fb731648f42985014daaa27211413e22 SHA-256: bf033cff328aaee18939cbdc92855ef6dcea6d40d129245bf33efc82bfbe4985
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is weaponized to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://goksirlambinowice.pl/img/upload/files/bamepasetaxefuposesegafaj.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc09acce1b---32548395322.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/vetamodabajon.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/2607624633.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/muluwilagazuloseg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/m1rpng9safeh4b6gsqp9t3l9o2/mibowu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/vejutugibatesux.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139054de6ceb---bidarurutoxakafikoluw.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/21274284230.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109010919388394.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210909232139_dho6np.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/lekapuxomafexe.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/palinijixuri.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/pumevorimov.pdfIn PDF document text
    • https://aahs.givingplan.net/sites/default/files/editor/file/dezegixekuxixosefudako.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/23236903683.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/41540385936.pdfIn PDF document text
    • http://fittbikese.hu/files/file/36502901309.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/061e1e88f8b654a1d2c43d0424f268e7/vagelodoxuwevixakubumetev.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163111969763.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/16358895314.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/pifitevujurerisiwag.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/42689001264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wps+office+apk+free+download+for+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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10684 bytes
SHA-256: 0705ee86146d7aac6ea8556ba0214106ea92685dceb2a30360cc794a50571b05
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 17564 bytes
SHA-256: 72ad21ce729b287d57f769dba5beea1ecc9f617737f168ffd184087c600853db
font_02_sfnt_off000120e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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