Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e2326de3b4a855…

MALICIOUS

PDF

94.2 KB Created: 2021-07-01 19:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e3c364cdfd3dbe9eb94accd344fe843c SHA-1: 7c2a3528a8976179fe72c60766d62b308dab9130 SHA-256: 39e2326de3b4a855b8b85bc2f84f6d1fec73a0cea4bd99e22107122eda5a8810
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. These links likely serve as a lure to phishing pages or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://krisoc.ru/uplcv?utm_term=fixed+rate+corporate+bonds PDF link annotation
    • http://keifo.ru/ckfinder/userfiles/files/31829404288.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/zisigedifomelogatelu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/99516489927.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/91824951039.pdfIn PDF document text
    • http://benly-carson.com/product/files/22908399294.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609156439c76c---5144302623.pdfIn PDF document text
    • https://amblamy.ee/upload/file/56112573246.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/39907251450.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608756976a904---36544573132.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/leziwojorisexozenifomanuv.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd393a129e0---26653012736.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0dgviv3e8vpbimug9c7kjsp3ig/73507695294.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k8otc5aneuaipblpomue9brsqs/65992975491.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ribupisivarevozevuzovu.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v81o3l6vljs7beu837u9lgr1k/92386952295.pdfIn PDF document text
    • https://deepex.hu/hirek/files/vitamotomati.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9e9b55536521ad82a3c8b16f541f734/tezeberuvibafajoremujele.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/woludikotokov.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1b3529691---jotat.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b62930b981e---tewenuvav.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/37547893176.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_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 10680 bytes
SHA-256: c3871f1ab34936853a09df4c5c5327e5f14d55cd8dcf46484d25a2835c154f2c
font_01_sfnt_off000124f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D05 17780 bytes
SHA-256: d711095ea232195961e9d61b46ede430dfdddd45199d42ddde1737f59eb5b832

Open this report in the interactive analyzer, or submit your own file for analysis.