Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8c3cb7f24306cb…

MALICIOUS

PDF

125.1 KB Created: 2021-08-05 22:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5dd45f0b385d7dc132aad4208cd1def9 SHA-1: e222eab6d1e4d62e618e3952d0e69c18f3a0593e SHA-256: 2d8c3cb7f24306cb054315abc1a03ee2f8e1d31c984348165d14bfdd3daed0c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/25ca2a7be8f3e5b17adc7fe2782ba51f/84519979961.pdf In PDF document text
    • http://parkhighclassof60.com/clients/871169/File/genonubulugules.pdfIn PDF document text
    • http://someteme.com/archivos/_20210715091013.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/2387363457.pdfIn PDF document text
    • https://chpcentre.com/files/file/81657476615.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/er0n5qt8rv1dcfssjv6actkjj1/93285645135.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122a68382e---59549403676.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086828071cf7---newozitujakade.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/72356815146.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/3019117315.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825392e3eea---kaxaneguwisub.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pimeregifibixosut.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb68d54cdf---60038433874.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/41706871504.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160941d26200bd---sopepepir.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/nadexoxeferuge.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/74741949954.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/ronetinorukokenebex.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/baxawubaretokew.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6eguah9841mpbrfeaje3d4vei6/jobafu.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210705063452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cuento+de+navidad+ray+bradbury+resumenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18671 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_02_sfnt_off00019bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BDE 18728 bytes
SHA-256: eabbbca0a8bf3a4b48c59bc9084590aa1734f27e50bfcc1fe6c220702e60da62
font_03_sfnt_off0001cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB66 10812 bytes
SHA-256: a85f81a4f5bd0dac99d30cf48053b649ba65a6517798790fa5a7f4390b68295b

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