Malicious PDF — malware analysis report

Static analysis result for SHA-256 9908f7c12c3c5fcb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 03:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b970fb4a08db0888d4937a1e4c59bdf3 SHA-1: df58131fcd1c006f6351ce274f9475139c711414 SHA-256: 9908f7c12c3c5fcba7db02bcdac4690b1fbba68a567101b2ed9e77160c05db5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://smidgel.ru/uplcv?utm_term=baixar+whatsapp+no+celular+samsung+gratis PDF link annotation
    • https://olivier-daulte.com/ckfinder/userfiles/files/44676540778.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/70792226011.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/zomuvesukisonepug.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/xawumomijakudulovi.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/23177890328.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/05q2gi2sk7lnfrqrcr0qr6n173/gibuxurepinakovupubikapuw.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/51011582346.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/42799030214.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/50006784162.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/54656408845.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/dadipalikalogigozanujojiw.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/10454677836.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/watoduvow.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/87423392346.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/82454137600.pdfIn PDF document text
    • https://luminex.pl/upload/file/zodekutimir.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/13943188505.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/rumiwekavulovododozu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u56t7m21es8dv5r5921lumvbal/rilorasarinubinojileveb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b04956b5c---xinufam.pdfIn PDF document text
    • https://phukienbep.net/media/files/benevokuxuvigujetaf.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/vodegutemugogiriju.pdfIn PDF document text
    • http://888chji.com/userfiles/files/5318179434.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/72514573300.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/5276007048.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_off0000bf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF81 11164 bytes
SHA-256: 532f4844f3b913e6ed19a13ee9dd929b9cb03cc5471de04c573c7a3563ce7c3f
font_01_sfnt_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 17028 bytes
SHA-256: 7092ceace76d1333d18f7882148e01b9fbe6b936cd178fc5624d105bf9cc16a0