Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34c1853b43dc2fe…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 19:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed9c974ccac6b06c9b94afc412d1fb5f SHA-1: 0a6c85671891fc522fdf296b52d02eddd3b131ad SHA-256: a34c1853b43dc2feecb18e70264c7526513867efed66f57e8bd3bf9cccc01385
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to direct users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bannails.com/fckeditor_userfiles/file/tekirozozosusemanisikuk.pdf In PDF document text
    • http://teplolux72.ru/upload/file/90265223023.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160819a74c4614---nubidukulixoselowoje.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/29000574f2e9718f617ef67f2b317ec5/81187927770.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1eb9e7807d634a4b4121c807927c3c12/78134742950.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/sasaliwaxufusudegitasa.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a819fccc518---jixuvoxutej.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/208dd3c2438feb61fc23724cdaf7cbdb/27406931475.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/viwifuvoruzerub.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/puludajunadorup.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9b0e6bd2508231501c59bfe358c85a93/31025026290.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/geboridafefudupofote.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/27145817279.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/km46805an822d22nd3pnb31rvi/ketapasegezimi.pdfIn PDF document text
    • http://dd-eng.com/files/files/23542792415.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/zarelubu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087850d8cda1---filulilis.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b0662849---38022009235.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/24524357216.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/53222445901.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/96110834056.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1610b387d9f13d---72823341205.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e09297ed7---14920560715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=examples+of+detail+oriented+skillsPDF 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_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 17652 bytes
SHA-256: 4b54bb7d2dd97221dc3d0c9fc621ad378f053725306d27bbdc69a574dace14c1
font_02_sfnt_off0001237c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 10836 bytes
SHA-256: d76fdf0e0412e0db7835fa3aad7acb95f683351e87042fddf6026224779c4233

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