Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b315be5cfd6821…

MALICIOUS

PDF

77.4 KB Created: 2021-09-22 11:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b2aacd7312536e7470b5a3b21d05b26 SHA-1: 20af09c82e9a3a3a4643901e96b51c59b3adc445 SHA-256: 58b315be5cfd68214259ba44891fe1e7c873a2464d7e8230278bbda0f7c88c99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the malicious activity by interacting with the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=how+to+boot+my+android+phone PDF link annotation
    • http://magic-mugs-factory.com/uploadfile/files/bowogusukarilaj.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/79211965622.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/69651488858.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/62990169000.pdfIn PDF document text
    • http://gardatrans.com/content/Files/labakubuvavofewufozobani.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/xuwojafimudomudajigebas.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/kijaxomo.pdfIn PDF document text
    • https://kopari.hu/files/file/xifukibipewiz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379c6338933---68526878269.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/1360013829.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2a17b420e5d26327f905e102a5147916/soduxinojaz.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8b3htp5ps45t7dbkfc8niv02a2/semebe.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/47325281553.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/3957657775.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/plfrkddh3evfm0svo7vu8qtbg2/99172755895.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/koselilujuriwo.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/69137256205.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/19915429789.pdfIn PDF document text
    • http://rooptex.com/uploads/49624722962.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/61087712657.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/70721424826.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/tokasu.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_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 17728 bytes
SHA-256: b5edc05b1949a04fb94fc58b213f1fb113a0d8e78cb813add822388ee6e9d893
font_01_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10772 bytes
SHA-256: fae288463ae5921ea10d06f90b7668b3630d0089fbd1885f14e87fe20eda2548
font_02_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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