Malicious PDF — malware analysis report

Static analysis result for SHA-256 828b43ebbc9546b0…

MALICIOUS

PDF

82.1 KB Created: 2021-07-05 05:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3b3339d6328d097289c252fdf248e75 SHA-1: d2dd581807cc784f91c0f762c14c84f0ee365c4a SHA-256: 828b43ebbc9546b0d7af5e82c21702ca3338f00faef3eb86f8172f7dcce65720
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/194234dd59606cf3d2093e6b467a4922/51063524783.pdf In PDF document text
    • https://nevisnews.com/userfiles/65521287089.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/40823480246.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5tou8vr42qf7n9vnhlhijgofd7/93322109802.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4b106870fc80dcd6f9a9aa2f9d35909/vigosijesakikisa.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/33755407856.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/13679498633.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cc27574a---fakovatilegadidelugome.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/80823874404.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160772532c810b---96872676613.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ac288bad668fa82b63e2cf8b9941de96/dogedav.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a53bcedbc875124268f8e1b1d5b39c0d/88374608974.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c00eefd4f79---vikamagukemavevunadefap.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc014356bb39c1b701237be629e4f2d6/xemakosadivujugo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/73265476725.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b300483806c6977084b2c9fbae24899f/79529956243.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fe55527c9e8749c2d6596c69b33119c6/sufeborurakutareregofepax.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/padirenumikejija.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1bb2f5f14abcbff942cfbba82c0b9de8/21694095876.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/8626317115.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/meritedagezapiruzosi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/68371920867.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160969905cd4b7---4212130702.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/758dd7298ba6a112f5b0400808fcd45d/peziniwonutobisoz.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/12304485005.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d048b0d9f---81864258133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=second+first+impressions+sally+thorne+epubPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 1756 bytes
SHA-256: 51d2ca4ece2e2e777a0f4cdbdcea213d95c3e58bf360719b9a1b43bbbdf041f4
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 11312 bytes
SHA-256: 3d532a43a8f1ba145d09c6a54009437abfd6fe19267dc2a90533ed79d5142c72

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