Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cceae264aadcd7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-01 07:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb95f8022392201949334faaa74d2d54 SHA-1: 84f7be8ab95873617e43480c30b3cca5e8a184b3 SHA-256: c8cceae264aadcd7a9fae7c17be55ad10765132104f84d50fccc798f966bdf41
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://drafthe.ru/uplcv?utm_term=basic+television+and+video+systems+pdf PDF link annotation
    • http://pokorny-podlahy.cz/UserFiles/File/webewegavijilumanifuz.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076496155f09---nugobelizinudosat.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/089p4cf84tslm5h9jgtdiqb693/47749932089.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/naxojibiluditojawidix.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/34943665481.pdfIn PDF document text
    • http://clingac.com/d/files/10319149447.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/pegeligadelabupovupate.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c114556148---49249845794.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/serixutataravop.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/df2171b6e4c8c565e1e062d71814d661/67062149421.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/74428991101.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c0785398e847d73cc69e6ef650cf6237/81047573690.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6dae66a46---18487045521.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cb39ea9e---jipesewaw.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vowusesameviralafimovek.pdfIn PDF document text
    • https://digireg.nu/upload/34765722052.pdfIn PDF document text
    • https://plasy.com/uploads/file/kodaj.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/foxegugivi.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/kolojivux.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/32782730943.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/jisatikapigizumipaf.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zavapota.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/eb4450be68d852fd2ec437cd82958b95/99209568787.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/powanulomibalabu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39624c7a23---46305792817.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/98499461785.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4ec1b56e---kopor.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/72151139281.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_off0000c06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 15360 bytes
SHA-256: 0a1f9a7fd304f163cac3e0e2599a5c6935b648dbbc4f259d0afd6327a5ca595e
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 10916 bytes
SHA-256: 7b34dfcfe1d476f5b1eec2470fe4f72c0346d7885878cf78e80fa3950666f3da

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