Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bbcb77c2b19c79…

MALICIOUS

PDF

80.0 KB Created: 2021-06-26 08:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e62190433b1cc04a220118904c9c3a6 SHA-1: 8289dd2f8955845b2ab31b65ae166f302ab52cf8 SHA-256: 04bbcb77c2b19c79360a85943fc44f5898e799a29e66522e83dfecb7a2b8a76d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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=create+searchable+pdf+online PDF link annotation
    • https://xn--80aaijzh9b.xn--90ae/documents/file/11846813285.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/parulideposuropirovulo.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/78929110949.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210620081341581.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/281851b38d84922a4f52ea4103498d83/77923473997.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210603014844_eldmw2.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gernpgab9c5sh6lj21o507mcft/26355741910.pdfIn PDF document text
    • http://accronline.com/userfiles/file/xazanagemojetobatawejelo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a29c0b783---63157467341.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/daff478c1a8a99231ed26294e7a3f4df/duxanipabiwimajulutisul.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ep1dnjn3nsoksvgviju3ajjko9/laraxagewe.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db462a300b---kunagevotukip.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/mixina.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/92579886159.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/840fc865823fe92591596436e3364f90/32646669778.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/321jcg15edafonhbikrk617pn9/78077280236.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-6/file/2021060104175473499.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/doxajakefefumopupusisufix.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b7c3cdab0---sobanodebaridivomoxod.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/151287619972b2a83bae4e51a97cd634/kenerak.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210531060606_1655902780.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee66a97dc---dumabapeva.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e557f4fc9970d4e5c7c3ec781925bce3/6568212678.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_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 10888 bytes
SHA-256: ea9018a937ad055818f9a27aba8bf49efe650c28e34f12c36e14c4c960aab469
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 16964 bytes
SHA-256: f868578838584ce092873256fa61b5f32daa8b0528ac9e3897609390e1c290fc

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