Malicious PDF — malware analysis report

Static analysis result for SHA-256 352f567c88b48334…

MALICIOUS

PDF

97.8 KB Created: 2021-09-05 04:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0d56de0e72a52db7e2cb17fa9fd7886 SHA-1: 224fe85d0ee88d2154b92304a10f389a099589bf SHA-256: 352f567c88b48334a61c00f2c9cd98090b18facf03e7f7d114f22b32d46f3c0d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing, designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=vajrapani+hayagriva+garuda+pdf PDF link annotation
    • https://buyafranchise.org/files/files/51280730550.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rpmbdf01745dsa3fukco747ga1/13733244823.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/51909939974.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2264da3733943cfdc1946a8d840bd159/biwuxitebunurofetake.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098799ce9477---12121199944.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/4522555094.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/21735099754.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/gejukiza.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/40299057116.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/kevarupigubiferexoba.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/222be58737d713cd0236ceca66d4ef36/roxewoxubuvolu.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/wewugigujivigitumubavak.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/43808511593.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bb744dd154c---wukixesizemotitet.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/dibironitusudow.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/73182852058.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/gebixowodutekaw.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/55256838421.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/14002057653.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/porup.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/69341826062.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/64257070266.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_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 20376 bytes
SHA-256: 0b1d5bd4411e1e8171926c2304c9327c41047759b19a70f9d1acb5c2d24cb5c0
font_02_sfnt_off00016242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16242 10592 bytes
SHA-256: 4367b10a649407cae742f3a3dd6fb4990d51d1ed83f6eaf2b5b1b1ee67c557a2

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