Malicious PDF — malware analysis report

Static analysis result for SHA-256 771af30e49c98e1e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 19:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1489d767fbf74d6488b6ed5bd02e1454 SHA-1: 23bd77637f6b22cf02bd13b8ad4cca6b28ee46eb SHA-256: 771af30e49c98e1e1eda90147996c7da71891bd78a2124b22071f4a4c0c10eb4
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 phishing or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d31d8d4b709eac3c4b97881449232004/guvugaxelusitenobosabo.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd6d5bdf8---xubofulopojobogonuwu.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/panozulesupema.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cidlnq91fc08rmb8t1o8jeg4bo/futip.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/2983103222.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/6855151260.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/bbf5d5494428c5b8ac853a9a38853a06/71798120131.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b9b420c84---vitikewukerep.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/47432862807.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021081415055873499.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/86752579642.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/81400346616.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607280419cf3d---lutogazezukakilukak.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e560a2ac9---38950461753.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/68680227723.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/21881370659.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/80972213008.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20e04c73b---terajigorugetugupuxadog.pdfIn PDF document text
    • http://cycling-software.com/files/file/dopiwa.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/3b1pa9ui2753utgg4ihn6esu01/ruzuzinediwivukubukez.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083966b6735f---powigakit.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160df435515846---13985838810.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610967ff3e442---gavapubadunubodamiwives.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reduce+pdf+size+in+adobe+reader+xiPDF 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_off0000c68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 10916 bytes
SHA-256: 9d9cfc4a80b2654ad0fda29437e59047b3f0350921c738a448d67a7b1cdca742
font_02_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 17096 bytes
SHA-256: 2924534027efb81835fa1332df73edad5dcdfa9009243d713d688d418327baca

Open this report in the interactive analyzer, or submit your own file for analysis.