Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a123e231faf02ed…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 15:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0450ceb8f421618eff692034bc2fc6f8 SHA-1: 41d83db957118a10fd441e9245c42ad40c10da92 SHA-256: 4a123e231faf02ed52e974b0d5ca02608eed7d6c605469a2c07bc15915f74a56
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://codecs.ro/images/file/tarolamumadaworeluramovo.pdf In PDF document text
    • http://yuhao-tech.com/userfiles/file/werezubire.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/gezokesukutofevanerolum.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/17504532337.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/66866861067.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/3869444138.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/omk3a2andp5dh1vbuoqdpma08k/61360219216.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/c03pv071ag7e4nfdenuq3v1314/47665914618.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/kenidovejut.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/6097947588.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64a9d393cc---lowaparamizibebizojifur.pdfIn PDF document text
    • http://nessium.net/userfiles/file/divobekozejakod.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/68915249784.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7b6e964a7a9f4db7ceb30164bb2a9cbb/misiguvoja.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/veminalupatu.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/vetufumonorizorixamanu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207afca5173---mesenefalunugumerikebi.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/dizamopowukegunopureda.pdfIn PDF document text
    • https://unosms.us/userfiles/file/6728256179.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/sunozazaxeja.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/vevodimereporazarokulus.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba882d792d---41443404275.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/52702428416.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/jalobapezijanavof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+law+pdf+nounPDF 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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 17284 bytes
SHA-256: f187887b969850be501f2414b93585950bfda32aae2101ee724fab3b9ab5bc50
font_01_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 10452 bytes
SHA-256: f18fda9865cf828588e1f1ad996cd2f57d9d877ca2f76d783dc1288a4622e16e
font_02_sfnt_off0001355c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1