Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9db18b179852b8d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-22 10:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c904c46d62a4700fc6f1ff25e49bfbc SHA-1: 27aa275c107b98d457767bf3209343d12b1e031b SHA-256: a9db18b179852b8d6b289ddea2ad22a5c3682411b24a199b67924480c08f4412
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links, including one with a 'hackers keylogger android' UTM term, suggests an attempt to trick users into visiting potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://agrimal.pl/userfiles/file/bizetojivanakokabul.pdf In PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/18153782752.pdfIn PDF document text
    • http://retrofotr.cz/files/file/42227261162.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/47629537097.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/74541053840.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0bdd1b30---33994735981.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/diwudizebepujiv.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091022273052.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/27330458994.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/vipisesekadutuxod.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fimosakuxexenuregiwugazo.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/20800712605.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a5e3b076---buzukagaxoroma.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138541a617f0---23318418608.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/28492113937.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/61727396396.pdfIn PDF document text
    • https://trexanh.net/upload/files/52113535546.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16145054892c56---27111088286.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/35334184001.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/63465527715.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904213142.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/mijisaxubijelosewuvulojo.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902130814610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hackers+keylogger+androidPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 10644 bytes
SHA-256: de5848f8065146057af3ad955dca453b5fc22ef3f8efe094dff172f84e937e41
font_02_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 17416 bytes
SHA-256: 4802e9c1214eb898ea418717362efaaec86cf24f29f582a4cb9da1f62902feaa

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