Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5100c798104f65…

MALICIOUS

PDF

98.7 KB Created: 2021-08-27 02:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 156961457f62fe355c7851dff87de5af SHA-1: d0131fcce2337e87b0186d56a88223aef9d81807 SHA-256: 2c5100c798104f65a8526f0a2d94dd6c7bafb76f03c6fd20fd9814c7cdf4d49f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160726edf46c11---27561889395.pdf In PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/kadiwatonezosupedikufi.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/14001478022.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/27398962878.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/kazowigifijupi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b89948cc3cb---95390503872.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/8259285661.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/55528005008.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/48675741659.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gejetenepomumojedorutipa.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/47966639550.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gjr711futktstateanse8o19gh/50645797088.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13ccb8675---gilagozirakedu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/9896185994.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/13296220433.pdfIn PDF document text
    • https://coevent.ru/upload/files/6290169344.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5a6a118cd4e81c076fb30bf3fdd5f97a/jawalimiruroruwobixukoge.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0638ed99ce25fd4906fc0b641a9656c8/33743902126.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivekero.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607704e487c8c---83056012174.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070539c1417c---zopiguzopubuto.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/nowonuli.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/vumifidijotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=probability+space+definitionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 18904 bytes
SHA-256: cc3396d1830282ec5b7b0157e152eb54f8975a01a4e6f4cf626b20754c42647f
font_01_sfnt_off00012e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E01 16088 bytes
SHA-256: 9097553d388de6ba0c4695ab3f5748207509627cf951ebf2c052ca71e31497d2
font_02_sfnt_off0001433c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433C 10868 bytes
SHA-256: 33731fc371d2cdff33e3046c441dc473f8e6da336f42fad31652de85bd431a62
font_03_sfnt_off00015c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C3C 1684 bytes
SHA-256: 3fec8e686217411fedf5c747a5de1eedb32ae291f30483ab5b52b166ab10a491
font_04_sfnt_off0001643e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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