Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7654a8d30e23ee…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 20:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81d84d088e232f3c90daafc656ea5d82 SHA-1: 8a32cc2ff42d568d207556bda033f9ab993dff2d SHA-256: ad7654a8d30e23ee88fc5659dcbcff7e57809705c84d1c47b210db895c7f1fed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=inner+core+minecraft+apk PDF link annotation
    • http://envigest.cz/upload/file/83781882397.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909131857.pdfIn PDF document text
    • https://unitjaya.com/contents/files/57231338886.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/51817398300.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/35115578546.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f448130b1---jisefosoxigeluze.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca73ba33e---63976937963.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b86ae5d69f3cafa0790407a191b07e1d/gukos.pdfIn PDF document text
    • http://myesen.life/userfiles/file/72400516874.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/hhjuggf2u6ulh0ube6kjfofop6/19200729152.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ac92416e0---tisovoreper.pdfIn PDF document text
    • http://ccadl.com/files/20210904222608.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/pibepanumulumotewedafuxa.pdfIn PDF document text
    • http://grandfiltr.com/files/file/84672197964.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34024716421.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xefefefulaxedulexa.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/f4df012d0d9530019d2fe5404c41851a/65609792572.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/misumina.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/pimewuseneb.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/gubefonag.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/99592002933.pdfIn PDF document text
    • http://ropesadventure.com/d/files/67961327990.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/75617102131.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ebbdef21357d87e847d96bdefd9f7d90/52010661147.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/43685872581.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_off0000ba82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA82 17604 bytes
SHA-256: 32755ed5770af49212a5bb3363ea52098f17dd45fee901ed0db8a0cab9c1711e
font_01_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 10468 bytes
SHA-256: b1f6435a803e5e5227e4e8ab29494eb7ac60eed6c880294b3e8a251eea3b6fdf

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