Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a7707909406f73…

MALICIOUS

PDF

92.2 KB Created: 2021-09-06 15:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b3494ae8e67d4efbe65a55bbe2c77aac SHA-1: 92ebe0b6068ac521c8760eddf55ab670d41641ca SHA-256: a7a7707909406f7387b007e902373748c6b17ce668d305d1597eb85540432a1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with multiple external URIs. The document body is unreadable, but the presence of numerous URLs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=davisian+cycle+of+erosion+pdf PDF link annotation
    • http://maximaviajes.com/FCKfiles/file/83480543444.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5885de27c---19510917260.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e311f3cdace0d7c171093b6abfb36696/wibemimokutafitogo.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/fajikeporimexabaveweg.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/c4ab6050d6ce496fb382ac23b8677442/ralila.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/kunixafis.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609de49862372---wuxel.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/87067125166.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/bapinexamudu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202161861836773.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160722b51af95c---kedera.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/zukikezibosogok.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20dd236434---tolaz.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/42083776213.pdfIn PDF document text
    • http://01host.ru/userfiles/files/27004877614.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/84379771049.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/perijutumageta.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/32218474664.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c28ea9bba9d---36763142322.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a231de3012d---bivakowuje.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/boragopo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/kva1rgj35uplv6cjo7mab2dk9f/10719848699.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a873a597f5c---refifogesubegetajiv.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e705616fa3---6405260917.pdfIn PDF document text
    • 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_off0001004c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 19104 bytes
SHA-256: 5d09bd56f4878f1029f4de5269fc4fa7fc90758ec19d18c91f96e3b016104f14
font_01_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABF 10696 bytes
SHA-256: f056a8a613fa515f4d3009a3ef9bc453e3a585576b06f65d52be8f176b28b236

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