Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfac4a436862177…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 01:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e55da45014ba5037a3b3ea0b4ce9e90 SHA-1: c1fa1878c51bfa05aa984784925a27e684c84d43 SHA-256: fbfac4a436862177f3cd199b01f97451ae74921296809ddb79cdc3cb74cd6490
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://szjwwj.com/userfiles/file///55876162127.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614114b4b12a4---34511109000.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/43228401404.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/kogobulilek.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/17948187633.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/8092659977.pdfIn PDF document text
    • http://redactron.com/userfiles/file/nakixo.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/61286532696.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109021203245862.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613176b5a35f9---kebepipumupa.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/fojemejagevemu.pdfIn PDF document text
    • http://biosite.ru/images/news/file/66340090218.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc78b8d75---bemidizukafadowezodad.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/65025278158.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e81818b0d1c284f786f921dd61451329/56502621932.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xosupolitom.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/53847928784.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109010150084665.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/xenotibazabofoki.pdfIn PDF document text
    • http://secretinvitation.net/images/files/reradi.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/divum.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/69810573326.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/ketusimawebavukogixi.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/4300519137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=calculator+hidden+app+apkPDF 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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 18720 bytes
SHA-256: 92ad6d0f681e3da6ca0d7eab05019fb59cddaf6710883f4c8a8e2cc63b74c20b
font_01_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 10664 bytes
SHA-256: bf1242c3c7934a19136537906b83b0aa720f0204993943a68d3037b0c53bffab
font_02_sfnt_off00012dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.