Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1563e3541a8ab56…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 13:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1eb9dd9c06598b7735e3ea79c370c77f SHA-1: e266c1efcbaf7af9e39f4d923e52ab436dbcc9f2 SHA-256: d1563e3541a8ab564859e384011db45857bf7fcd0413236b8b20c6f831f1868c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely related to phishing lures for software downloads. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=download+software+to+convert+pdf+to+word+format PDF link annotation
    • https://condicionamentofisico.com/arquivos/file/xavalixuriwotujavusije.pdfIn PDF document text
    • http://www.asslar.de/downloads/saxufebes.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ed2afk6edojuajfn6bu73tbj80/kujuzowodojaromifi.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bf56d798d236145ae344b11bc324c7fa/67600419023.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210827194519.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fvehi3essbo1dlci09qcabc1oe/44681375908.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/b0omvc7m04qui5c5dao5l4ngm8/vuridazikuwituwaledulufo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2f41ac859824ebcd9fdf318e436f1e3f/mizojanetosisapupizato.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/gomaxomofaku.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/804f7ea77ef93e25814a02c8a80f9cc0/giwapada.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/47372079335.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078445e2b030---xojerapirokirapupud.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l9prficnhi5695e9kiiecc26t2/kutudonejurono.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/26921058623.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842a01effed---gojemasijopiposo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nq9nir07ad027mm3d4a61br923/dekuferifafixasoxizugowug.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/96657741230.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/85091301371.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e8f5ec35ebf7379a7c7669f5a19d8a1e/wezewidixakukosadopiziz.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210728115847.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcf41a234---85362704672.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/19428441771.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/nabovijiv.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/29194619290.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 17600 bytes
SHA-256: 685065e9e2916e79522509fa6c0820e6fc7c226c2e05474c2398128ac36b9b9b
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 10844 bytes
SHA-256: ffa5c871241f7a3eac1ab1e5c654c5081825644335113011144c948fe0137c54