Malicious PDF — malware analysis report

Static analysis result for SHA-256 d623aa782d847674…

MALICIOUS

PDF

91.0 KB Created: 2021-07-18 09:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 843397367676eacec704340a96ea28ca SHA-1: f67b57b40bc8357107f99574153b9037da2b5254 SHA-256: d623aa782d847674e0a2ef12b6365f0abc7e0d6cc11af49c6577f6dfc40fae8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to host and distribute malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8267b041d4---magosutofapitewodefukunon.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/52d6c8f35b5be74fc1e1d17b52fc4bd6/duxuvujijeludoxiledemedim.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ad90522ebd8b0f756275f9b1db3dd91b/zukegode.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070e0b9a71bf---78874428189.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd120f856---rutixiloterowexekale.pdf
    • http://aplus.to/userfiles/file/ruwozuxil.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6e153d43f789b65dcf94f77598d1d74b/ruwubalokikobobazarunozu.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b591e8959c---gisepego.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/icdfgr7l5ce620vjpdl597nack/65919493430.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a53be8fad7b34e8a496fb80a12e9ec2a/jozufidomu.pdf
    • http://maslag.eu/userfiles/file/zizubovomuwuxubefape.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4b694dd62dada404725c94055986b5a2/nixobevefiwi.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6768a57ab027b58b9ef216d20cab6cbc/wavasukadugabafuke.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cff4598bd---nexigegeruxugubileva.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16240895155729.pdf
    • https://sanagustin.cl/files/33353386258.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/53550309559.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/e91d3792a0f307aea3d4601221c87577/50462840988.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083946c5d7cf---vikitomavewebavisixoxit.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db5c8cdfe2---28728835449.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5dcd5f3c---15538503866.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/e5598f11d262c7019faea8b43d070b1d/fofebuvizokodezeb.pdf
    • http://wolfroccatiassociati.it/userfiles/files/rekiworokatosifosev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bsc+chemistry+practical+experiments+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_off00010009.bin
39597b085526a8d868b3dcc9be149f0c3d9785c76085b72394814a966744d478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 16604 bytes
font_01_sfnt_off00012b17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B17 16792 bytes
font_02_sfnt_off0001432e.bin
8c2741072308e65de5274ea5a7f0e2ff5bc9a59b96a8febfdd285375b693fad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1432E 11032 bytes

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