Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1fc2e20e9bf4f1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-07 08:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26e0351930e3ee2315827457c80ce129 SHA-1: ecf12cf0a7fb511e91bbb6fca66689fb85dab5b4 SHA-256: 9b1fc2e20e9bf4f1427400f047e7ae8bef900b3126771e958ff8cb46aeffe80b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://kbchina.de/upload/42621489224.pdf In PDF document text
    • https://cicadit.ro/UserFiles/file/66082160977.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kakononizizolewipabusilif.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9c9b9beab---ridapopojerujonixuxusin.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0269db29---99717454806.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b2f9562e1dd1ab3bac2eaf312f24f627/95326126880.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086a81ba90b0---zivoxomek.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/zavumabubiri.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdca0f23b0---gezifowirumavunuxiriza.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ab8f0216---pugewuwefamom.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/3e285dc47db33cd7127177c13d45e892/7838230736.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021522846134445.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161084ed46dc6e---90493629106.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/guduxupisefuligurisik.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vepejunibekojuzi.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf77c3e7d0b---nuzofo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/665118e9b2b96d9147208b1939d70e1c/45987384753.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021081104361073499.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af04f119e5---muguzukiwujofevijowi.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/20308409387.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/86cead51fee5438e49637726712b4b0f/walukegenogusakal.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/gumipuzosutibobumixakuwa.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/78240002137.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/56393432536.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/bejuguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=word+para+jpg+ilovepdfPDF 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_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 17020 bytes
SHA-256: 5b6988ee267f97bce78b3f43fe81309f7e99e732f0efd3fa2c3043b241dd57bc
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10492 bytes
SHA-256: f5c39414a584eae39edef21cc90427cdd9bffb629de8c1b8481fa28b04764b9f
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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