Malicious PDF — malware analysis report

Static analysis result for SHA-256 653fce8306e0efbf…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 03:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec957929fc72f3307de3c97cfe5caa89 SHA-1: b9082ca0fa046df27696957e27564e3d8be7f0d7 SHA-256: 653fce8306e0efbff9816f95deb50c5fb883cbd5e61fddb636b1ce5869a94492
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve as a lure to redirect users to malicious or phishing content, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161382cf9eccdd---popizofakoninivaz.pdf In PDF document text
    • http://studio-rivetti.it/userfiles/files/35283938959.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/busimojisezozemetigutigar.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109120713246941.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/gezujazoli.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/fixirete.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/89921270808.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/95747811441.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/42656128349.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/9241345587.pdfIn PDF document text
    • http://protok.pro/upload/files/72892004763.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/99597305842.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1824bd861.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b401068af---17911645210.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/65630591989.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/mujexupafipevavodero.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/jorobi.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///tapiliriduxiwikigo.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/57753216526.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/pipiwerulaleledig.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/57110881513.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ace2e40c8cced016ea2ad24ca67df76f/27864777601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=annie+2014+full+movie+englishPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 18524 bytes
SHA-256: 3608f59de81f488b2dbd839b46ea9d48f55e943d10891ac478cbed41b8f8fae4
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 10820 bytes
SHA-256: 249d4612669b72f490aaa5264a81e10c5773377def68cbc110fc5047b32d0fff