Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2587b4f91ed40fd…

MALICIOUS

PDF

99.7 KB Created: 2021-07-29 22:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b59391a315693a642c003260ef69359 SHA-1: 0fefaa7c0bf43c98920b46944db64d8ebda7bde3 SHA-256: e2587b4f91ed40fd05f8c2a0611edf08cb1348edde104d459728d77ef1d3f1d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are presented as a link farm to obscure the true malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/befb5e06bd8d497632f2bd2456f7bb3b/91153291382.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160729558bea7c---9564497860.pdfIn PDF document text
    • http://npas.ru/pic/file/24675884727.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107261446023649.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160edd0a10105d---45669831887.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/1b332e7525674e9663b380df10d6dbb5/94191396917.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/zovajevufozogu.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/k45sivppm7qck0qjg657i8bmbl/guwazasidotanoxamex.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/ravuj.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a2omqopscebes8113u76nklru7/pumijisebu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92ee20f4a0583877a418613dc336f9a9/35539258664.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/jupozulezipuwuwulifotazu.pdfIn PDF document text
    • http://ibb-online.ru/f/file/dagewilofa.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/95497335876.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506033132439320.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/61556024725.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/07f61c178ed99a575c6f7198b7e05c22/77754703655.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075632826b93---nilopapuwetopijop.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5fc80fae7---99135424748.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c4dca0ef98e0db6a9c7689d04f51c994/setinufawuwevowipidaluv.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83ae485f8---wajagijepupasikolut.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/89761253836.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db258393a4f---59871298192.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b6690d110---11898580690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=caida+libre+fisica+libro+pdfPDF link annotation
    • 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_off00011935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 20344 bytes
SHA-256: 2426d5aa995e5831f4f2667ff9eac9f54ec75ea00cde0bfefce77607637ce204
font_01_sfnt_off00014ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166C4 10580 bytes
SHA-256: 6da6909ae63723a5d14aefbcc22952247bb4ea4b38fce6d24294ace26e361c2c

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