Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5b0cf160a9d5fd…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 07:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fbeff5ca352fc396b26cf53f01fc502 SHA-1: bc0432699cf82c515e21c51a3cc0ea4e15ffaa80 SHA-256: ac5b0cf160a9d5fdd7f753df1f4a7ba99dfc89b0106e225d2138ce42d840b6a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://asckhn.com/acskhn/userfiles/file/75659544402.pdf In PDF document text
    • http://noithatachau.vn/webroot/img/files/ladirawaxibedegirifineni.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/Bb16SLYaQ3dg.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/suwigexabomef.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/60730082139.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/xidesidulofozokutobabavor.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/95194326254.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/62424870626.pdfIn PDF document text
    • https://laser123.com/geektic/files/5893196243.pdfIn PDF document text
    • http://htwy.com/upload/file/boxuw.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/75081724722.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2408cb35---23954231971.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/95605124576.pdfIn PDF document text
    • https://satesayap.com/contents/files/rawer.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/kipinuvilijofelowonujeso.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/dopexifupilu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161326da46e46d---98187225282.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/48916063390.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614274419db77---81137030082.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/6323031184.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/75296574508.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/zofoxerobek.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/fokakexipo.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/52342093760.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/senubokefajavatipas.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613158bd92054---31851389004.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/tarifepazoti.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/14234018409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=alerts+on+my+phonePDF 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_off0000bd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD03 15944 bytes
SHA-256: 693bf3afb1d5929d6f0d1b778e09398965a918461ab14afa9f358d5072300353
font_01_sfnt_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 10360 bytes
SHA-256: 75b63e778c00d50b206a242b306c714cc8d84ae8f31e7b80b207a3a3d126775c
font_02_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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