Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1582a0a8c088556…

MALICIOUS

PDF

95.3 KB Created: 2021-08-20 20:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76aee32b458a8b63ebbc12655cba4394 SHA-1: a812390da77248f5185869b0ebb2748424454118 SHA-256: a1582a0a8c0885565b21408639a0633d81ddcaed0f468cddfe08d679b04b55fb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, embedding numerous URLs across various compromised CMS upload directories, suggesting an attempt to distribute phishing content or malware. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=hemoglobin+buffer+system+pdf PDF link annotation
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f69a364b---55144400189.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ee99c4b891a72152dd41d675f85b81ad/89118689540.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ufkb84frs81deptud6h3pheke3/jekepejitugewa.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/96567719955.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6c6349e18fa591201216dc0657cfb9db/58619492956.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dfae3dfa9aa3aaf97b1670f7b5646a28/29843880647.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2eea5558---27876990460.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/posemo.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/88130864231.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075849824dd6---17671335979.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/78468023893.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/modawarolopupaseg.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/jemokuvidonivalalob.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/sull1c14e5k20c9oj0mnhlb441/45019683754.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0ea6816228bc5b6420543d768d050afa/sumer.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/44058227828.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/33702570735.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/582628657.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/nunaxonigetaresigasen.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/24893185486.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/57252374382.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8f8382341e7662fc094e15e7af6bdae1/fupanetigimabukeridu.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_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 11024 bytes
SHA-256: b82c5842cd4632406a640e71d17e48da99d7f9973e64e67b120f66288569798a
font_01_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 17100 bytes
SHA-256: b2d2c770d3b796c5326f9375ae3b8e4224b3ea0a8791e74081947e213a7d32d7
font_02_sfnt_off000156c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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