Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e8fa17de2bcbba…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 03:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f368f33524efcc5205a0ce08fe37907f SHA-1: 13854feacef4a93dc58230784fccf75cf0bd45eb SHA-256: 81e8fa17de2bcbbae1e414173b92d942a9dc8c11bb9fed6d5d417fc61e1ccf6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://smidgel.ru/uplcv?utm_term=watch+the+christmas+house+online+free PDF link annotation
    • http://elektrostroy.kz/ckfinder/userfiles/files/414045068.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1695da3a---kerezevifigeruwaxiro.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/terodapimu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e550f6b085dcbe46a0b3e12c821c9314/69305454619.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091013061116.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/68987491977.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bcc42d33d---61507558354.pdfIn PDF document text
    • https://kimcert.net/E/file/xovawofi.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/witikopin.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/73700483338.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/geguwelolawibumidajuput.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d1c681fd---muxenofadedenipekif.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/lifixakafodos.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/lexefagipoj.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/67104282712.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/74496845600.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/61953998877.pdfIn PDF document text
    • http://pinxedien.net/upload/files/77946532160.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/51004078884.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/98405164510.pdfIn PDF document text
    • http://lagrupacio.cat/file/33279977365.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2368d90bc26bbf4b49ba209fa5b3d692/66670932484.pdfIn PDF document text
    • https://papiratisk.cz/soubory/36805092347.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/54653371790.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/gogadotopiwo.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/voworu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d2aca116---lorur.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_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10692 bytes
SHA-256: 0b287ee4bc6afdf2cad87960ead4a75f4c460886b3360784c2e416206c7ad2c7
font_02_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 17600 bytes
SHA-256: 47e0aef3a096d39dff54e638d40e007984a74589724f1abe8e67b41c50f11f71

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