Malicious PDF — malware analysis report

Static analysis result for SHA-256 59042f1840028052…

MALICIOUS

PDF

97.2 KB Created: 2021-09-16 16:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4433016affd539cd2439d18a4132afad SHA-1: 9060d281a5137d4a582fc21d3fec464741b9a651 SHA-256: 59042f1840028052e3b09189ddab8bfb916278d2d623a7f831842f67cff7f302
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://phongkhamthienhoa.vn/images/files/27490005085.pdf
    • http://newworldss.com/uploads/file/biroben.pdf
    • http://actlogistic.vn/upload/editor/files/bekafotazixodepa.pdf
    • https://ceylanotel.com/firma/files/kizopes.pdf
    • http://qbcar.ru/ckfinder/userfiles/files/pixetobegefesodel.pdf
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/komamebajobowasux.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99993977464.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/xutevejifefopatorusuxa.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613241393abd1---85022381931.pdf
    • http://libron.pl/fckupload/assets/file/90716041285.pdf
    • http://escritacontabilidade.net/fotos/news/file/dobidofo.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbea39ac1---lelelumavutakuzovag.pdf
    • http://freeorden.com/media/file/dixobuxejulirodalutewa.pdf
    • http://getrade.net/uploadfiles/file/38886886516.pdf
    • http://baovekhucongnghiep.com/upload/files/70461516371.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/vigisagudolovamopulamos.pdf
    • http://kengosushionlineorder.com/uploads/files/wodagijitemasaza.pdf
    • http://baugeraeteverleih.de/benutzerdateien/mesilakejuxibubepasanenow.pdf
    • http://warehousetraining.ie/images/88994185814.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135b427980ed---26626848883.pdf
    • http://pibar.tw/uploads/files/202109030653407624.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dale+carnegie+books+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011947.bin
f543c5f8a86ea8812bc24b147694b25989c53737ee83caffb0eec4e6154c116a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 17424 bytes
font_01_sfnt_off0001463c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1463C 16792 bytes
font_02_sfnt_off00015e53.bin
489c47f1d1b1e9dc2c65aa210ca7e63915040ee089a1b04fc9c031318669c768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 10932 bytes

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