Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5ee8b9dd60f4ac…

MALICIOUS

PDF

86.8 KB Created: 2021-08-18 19:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 649e5a1b2cf058f874d2489a595faf0f SHA-1: e94a8cc2813c49aa068bbbadc12b5f9994df47c8 SHA-256: 8a5ee8b9dd60f4ac36d4d246ca4dcf3f87762cfe4e33baf5d63106e79ebde6a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a phishing lure.

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 https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/07deb657049fe5d04da5d3272eaf1945/81138654904.pdf In PDF document text
    • http://waterreducer.cn/d/files/43553703441.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/34845711513.pdfIn PDF document text
    • https://edusfera.pl/upload/file/lukelawebiped.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/97630968163.pdfIn PDF document text
    • https://maclashoes.it/file/93804194270.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/dp9ogp8g33l3cof9cmisoa2du9/xejabofovalezamome.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77c61aaac---61663161941.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/37436727126.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/zubitewosixedapabilofur.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d6be44fa---2845129033.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c64a5a214---14702582939.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/0b70662ca0e25ed345e9b66d3a09c3ac/geduwuvuxodepave.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/wiwojagomo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/3j4gmlc1n8dcl3jpr7qc92948r/wogelamifitewug.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3f8f9c4f6c239f8390ec22bcdfd3628b/26462987768.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e208a5972aa---32014628986.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/dikoligevubexugufowogo.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/91536287752.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608926431bfd6---53672873804.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f422f3961---gijojaduwefejuduje.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/57774718659.pdfIn PDF document text
    • http://o2ashop.com/ckfinder/userfiles/files/zerozasapabemapinevototoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=qual+o+raiz+quadrada+de+225PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 19684 bytes
SHA-256: 91c293778982191a20b783bd39766b1312d195fb731904e6f13c61d9f4f4cbbb
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 17524 bytes
SHA-256: 37a92b69627209b518c5007c2d533ec2081484f31e6978c852f441ee7e36fc9c
font_02_sfnt_off00011aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 10488 bytes
SHA-256: c26e0f2b1b6b59bfa83f42b158990965ff9ad7cec43c697ce50188f649e2056b

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