Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e9a5c1a505e473…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 15:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a52b75600fad512bd4616adf9d7c536 SHA-1: 3be2791fbb7d677b123d77117f664929e3e3c865 SHA-256: 43e9a5c1a505e473e0742a26d76f11aa2d6373608558660059bf5626a6f836f8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of external URIs and link farms on disposable hosting supports the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dydlhx.com/upfiles/file///zuxapemixabajamiwino.pdf In PDF document text
    • http://c2r.su/uploadfiles/file/2021090305192873499.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9920b1b487d39663e8d8269a99eeff16/43751071725.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109050900234160.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/wonujunipebigolun.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/ripuzudekavap.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/77757562304.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161437461175db---19564313357.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/bidigewuru.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/96106710351.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/kemekixuxokonufapujag.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/dewunizetabow.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/71656004633.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/guxowarotakaxelilanav.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/jeforilogerulobujuwul.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d34dc91eb3---46151541712.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/9567703588.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/vefokan.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/sizufejoxovagibidu.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/16271002116.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/23470996719.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/jibimubuxumedu.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/4936798565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ready+to+rumble+123moviesPDF 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_off0000c2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2EC 11116 bytes
SHA-256: d6300fa81ab0e64ffc7740e2a9652c305d5fd289352dca7e194b093e22033253
font_01_sfnt_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 16624 bytes
SHA-256: 21ab9f60fd654ab5a95ee0db01d62d1f875d79b46828b1a761bd72f60e8df262
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1