Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb2cb8736707daf…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 19:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c19873b95fb4f6f1d5db0566b45658e SHA-1: caf5df17f8e32c5755f037dd3e7dacdbba615153 SHA-256: efb2cb8736707daf8af51c85f3b09aad475713390f1d541c050b50fec1c795b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://szentdorottyapatika.hu/files/61207087814.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137dcfa50498---63045760716.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b8ah69pjo100nve3nc36nuhl1i/feliwutemibilamufe.pdfIn PDF document text
    • http://zerosquareonline.com/file/nezononusisukojizakizega.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142f955457de---debesoba.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/bunuvatozuxowawanosunar.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140920b90a0c---82717562417.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/xejumonulegavok.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/kufer.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/33077685737.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/58139499806.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/wirizufizabaramutoju.pdfIn PDF document text
    • http://silver1979.com/upload/file/sagijeminizusan.pdfIn PDF document text
    • http://videocycling.info/files/file/83234149355.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/60db3ce831714804af661194415309fc/91037124116.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e0bb1cfb56dee9d35d74a3e3f6b5a714/45274064151.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/14188067340.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/22749039265.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/61945072138.pdfIn PDF document text
    • http://infunplastic.com/d/files/98275296171.pdfIn PDF document text
    • http://trieuduong.com/images/Download/22401715793.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/79647160360.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/52012476708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+apps+not+on+play+storePDF 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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 17724 bytes
SHA-256: 4da683d2e6afe212f48fecbab8f898a958df61870890d07909b3b86a36afd328
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 10320 bytes
SHA-256: 319ef3e34181584ccb402fc6c6b150bbc37f1094c8a4c2f3f82fc2b0e044c7e1

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