Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb951af3558da3b9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-05 13:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fb63355defeb0c59a5bd2ee322a6f94 SHA-1: 464a6abdd3ad35d239806ff8c41fe5410aaee95e SHA-256: eb951af3558da3b93c6a6044469b8fe671b24ae94cc6f97d00f71bf94dbe3351
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as a phishing lure due to its structure, which presents an image-only interface to deceive users. It contains numerous links pointing to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=derivative+chain+rule+worksheet PDF link annotation
    • http://sendedianqi.com/upload_fck/file/2021-7-14/20210714144807918386.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/tamamurutoxosowileketofo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b0e547b83---6441164173.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f17319480---lonavisobagixajixur.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/23545298469.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/lexuxibopatuvago.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/9a685726fa8595797c13379a9b240ce3/zugizu.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/31165485075.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/sifamimemo.pdfIn PDF document text
    • https://grancom.by/upload/docs/85495704684.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/mf84b66ub9lg3f8rutofcvofhu/wetoberizavuselawik.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/36aed73888a1ce1b10b8583670adcd44/duvesenixuzejivixenapi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/393005d01427323977ce9fb88177b207/kulegem.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf9402be03---97786795974.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b51095c38d---47550221912.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f56312e64f8---pibebatudoner.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/4074da17ad1c16ca1137a8612f0b8461/levijikakepavu.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/dalutonajedutanaluzojosal.pdfIn PDF document text
    • https://codecs.ro/images/file/45338645699.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/nujaxo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adab7636459---26635872965.pdfIn PDF document text
    • http://gardatrans.com/content/Files/4547149077.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/kutesuditej.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ve8bu6tk8s11tav1o0nks2j8u1/80330532737.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/35986272422.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_off0000b5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF0 10672 bytes
SHA-256: 9ade54798b53dc401739289ffc20a780507e1498aad785929e66d5d3cb637f68
font_02_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 13828 bytes
SHA-256: ffb188c6f920dcd371f1ce95679054dbe63965f05f0f468295b96d58c677d84a

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