Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d5afe2e5b4b15c…

MALICIOUS

PDF

143.9 KB Created: 2021-06-23 20:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a5a0df1fc7ae1e0b249c2d9c305a5cac SHA-1: 9b9cfa200c8add66ff973342d01e3bf49a1f1e2b SHA-256: a2d5afe2e5b4b15c97ec0fa6651d2a50e9ef923258e8b7b860312e10ee76cc4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or conduct phishing. The presence of a URL with 'adele 25 full album download mp3' indicates a lure to attract users. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing its suspicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=adele+25+full+album+download+mp3 PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/633a63a2a16d0209ae306bde8e083e2d/kesuwatavariro.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/9b9fd743a399fe601c4681e0626fe619/mafowasowudebiba.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/5774625166.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949770d7264---kasavokos.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2e4bbc5f3e591b4a50080e5b9257e98d/36493398881.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/43339632465.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/4f08f887a5890089a705014e60c4d898/ravari.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/42418103864.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/846fc8face818c26a8a60b6bd5fe0ec9/22293017807.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lirerukodexil.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a9175997---37288908380.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/37059279595.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2a719384be592bc0e4fed049f2463444/47114137841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001c010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C010 4272 bytes
SHA-256: 37859a8f234490b8b78695104eed156e115ded1bbf01cd797e4d376fd75f266f
font_01_sfnt_off0001cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF30 5552 bytes
SHA-256: f5608f775ebdab46c3faa24c0642343cefea721e76f2ba01909dd632c153d90f
font_02_sfnt_off0001e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E21D 16352 bytes
SHA-256: 8a657182c831ae990e6a99000db87f8060c8a36abcdc0b6ad0f66c5493e24409
font_03_sfnt_off000211d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x211D5 18560 bytes
SHA-256: 9a5d8c3c6682dbcca8121daaa35375653e8778fba6cec8a00e191cccd2df26c1