Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b758da973dd2ed8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 14:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3f633d6e2b79e4224da691af71db956 SHA-1: 8e583a9266fdf1364538720051a507e882e03a9a SHA-256: 5b758da973dd2ed8e882063a976b313082f32b4843fc6b24eaed240b4aaf37ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous URLs, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the final destination and leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=modele+attestation+assedic+pdf PDF link annotation
    • https://larustt.com/upload/ckfinder/files/kelaxetotopinegezepovoxa.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/tajalerepafivolanumul.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/87839890049.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95143d1d3211bdce1294d7f320ea8a95/94429973862.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23154a024---64275934981.pdfIn PDF document text
    • https://polytex.de/sites/default/files/kubepipeboxetomukaz.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/50867261367.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/bizoxesezabazine.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/vegavaxapapizovujupopos.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2715a0b38---bodunuxotofimijasufogiziw.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d647a48ab6---76665920589.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103005adb118---bixanokarolorobape.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/24421285817.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/44795570814.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/32669324840.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/161c09fd802b72c5c7c72f09ea6fab38/felibixaro.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/89420458543.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/veredegawukuvosumidomepe.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/gejup.pdfIn PDF document text
    • http://salwex.hu/file/78438754094.pdfIn PDF document text
    • http://hybsch.it/upload/file/95383780860.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1fa0fc1208b6f19a97c76f9b33f98824/vifokodagig.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/bojenexorifox.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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 10504 bytes
SHA-256: 82f5c937f327b81e9af00f629d672d7f80eaf831d36dced87939b83480d2caab
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 18584 bytes
SHA-256: 46561981c21cbe67214c75175dce74e5a69527f08be9ae525898dc4b0c40fec9
font_02_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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