Malicious PDF — malware analysis report

Static analysis result for SHA-256 a651b5442c11bb2f…

MALICIOUS

PDF

125.4 KB Created: 2021-06-25 22:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 92e1a4a3a9871c91e2837a49217912bd SHA-1: 221666ae9ba97e752214fb9614ddc2a23c3c0835 SHA-256: a651b5442c11bb2fa830d7b6e008faac27362adfe080f33438a46d24ca9b1fba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, but the structure strongly suggests a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://catamma.ru/uplcv?utm_term=uppercase+and+lowercase+m PDF link annotation
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/dc2b4a93b4bf2920835a68bd2c48e79a/nateborikegarotebovo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160920b79b0f35---juvavefokir.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/d64061dd07ddeedca1ca3ce21c3b41f7/40115555381.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/82203332680.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/rotazuzovizene.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93342172d---57688944998.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/54562699947.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c3e392a9fd44403189883047162a4049/janerizogifenowilivigone.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e4c8c13a8---gatidudusowupapulubekafa.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090186f4ade3---18422556730.pdfIn PDF document text
    • http://corporacionnoa.com/UserFiles/file/zoxas.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e160454a---rutabu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4797ea7e---finolejikisurumigumexu.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6546321321.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce883d1b5c0---zafavinuk.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2806a49a5e4e180980333e6678c725b1/26597361656.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/putokiwujalu.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/lurowogeritabenovamovat.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/64737148739.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rfunbb90tpimeao7kudsqdsfp8/mevibupojisuzezelipozi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5vo7h9t03q011tu075pcocnv93/mexusikopofur.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c66a2139c---mozubori.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7eed569fa---84035088346.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/28760426038.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000161d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000179e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E9 25108 bytes
SHA-256: e8e8cc2a892cc96b4d9dd6944f6322e6882000f96b3d5bd72bf95b5f64575810
font_02_sfnt_off0001ba3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA3A 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off0001cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFD7 10576 bytes
SHA-256: 9e9aed8ee638aab86c7a1d77e4883c776c66f61d47562755d2255d63ed5ba38e

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