Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdbffd1d20d168e…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 03:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6875ef781088f4db8b707713dc606e5f SHA-1: f545665b322fdf45b0b943a402ab6012e6346b4f SHA-256: ecdbffd1d20d168eb49f3f729921fe26b09e76d333b8ffe20a3748da8fcec2e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farm heuristics supports the classification as a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fa08bcf1---13817105769.pdf In PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d286548b7b0---komog.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g8jd3okbt7r66r9fo60ea31st0/fizevute.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/845f4be052bd86b7b0756be888c85bea/58676881339.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/11227812670.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pabutivumelevabor.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4848905ae21afc7b52fbefa910ee7805/9804065739.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/ruvexe.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4d5ee5f9---jepetabakefukijim.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210525075405_234266861.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kurugapup.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/diwigipusobex.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/8664253603.pdfIn PDF document text
    • http://btsis.com/upload/ckfinder/files/66222349023.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vrom6fql11cpknhrv2fmqp4f28/36366913289.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/29843795907.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37c0792e6---vigudekejoguxebu.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mflh9evqna0c9ss7ukbc9pdnrv/balazituvopibibar.pdfIn PDF document text
    • https://harom.ro/files/file/mapajaxefumuz.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/19010062930.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vidodixevijivuxil.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/libafozifarudut.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/borerukemebamuw.pdfIn PDF document text
    • http://a-pluset.com/userfiles/diwenawibuxeriduxarud.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/mumonag.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0096e5edf2---35121533281.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/94854729344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=font+awesome+5PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 10228 bytes
SHA-256: 2ab525f4acb55ec9205be5ddda319a174c427f20093444c32886ffa4275b9640
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 18200 bytes
SHA-256: 618ecfbf353ef8634a4f19a69333bd124c39968bcf0bf09493cf8ba7cb09f814
font_02_sfnt_off00012e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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