Malicious PDF — malware analysis report

Static analysis result for SHA-256 142d5cb1aa6aaaa3…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 01:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 96ce36e049b86c61aa35e4bf52ed334a SHA-1: 3ddb700953840d3337b3c1b9fa35a92edc04dedd SHA-256: 142d5cb1aa6aaaa369d807d9107e95d4bee718f9eb06769fcc6a8d6580245401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://ketchas.ru/uplcv?utm_term=bubble+witch+game+download PDF link annotation
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146008abe069---vawuxeti.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/70339234738.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/14a886e93fa2c018470f8d95d56bb853/14323721608.pdfIn PDF document text
    • http://rs-entp.com/upload/file/94689928789.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubojobebaxitolanifanisot.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210911201622.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/wiwosesewalaxunek.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/gexolijuzudite.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/liwegepuzat.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/makorobubate.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/9416901227.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/fetezoxu.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/55780349189.pdfIn PDF document text
    • http://datcat.vn/2018/file/zasasagapebusenata.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/65924938308.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8206adc6---69021249295.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/31179570786.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/tobokonusapipadunaxerab.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210905084428771358.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab2b00b6b1---loloma.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/66621033228.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/watuwulimudatamoxefuduwa.pdfIn PDF document text
    • https://yodobashi-church.com/fifawovisop.pdfIn PDF document text
    • 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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 10928 bytes
SHA-256: dd77429bbd075dc19195585dd934d02b7ba067b6c57cdf812677a19bc662e2e5
font_01_sfnt_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 17472 bytes
SHA-256: 56f07d3fc3fc955b1ec379e8ab74c02601a30b9782b17864f551d2ce2609a743

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