Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc97d58f6fb4011f…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 23:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d7024d1727ceca27f677c65aeea7a121 SHA-1: 866145b9053f4147aef184cc4c3d4d5aa4a7c2f7 SHA-256: fc97d58f6fb4011f5705a1da6848eb3efd29889133a3b056e5b0afe78eafaba2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the distribution of malicious content or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=lorazalora+mods+mobile+legends+apk PDF link annotation
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/41654023211.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/woxozalezemo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4fa8a16cd56284e544f0b9be45136d56/sujiboxe.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/kuwumejexojowulosuta.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/81251144718.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/mifufutemezufiwuvi.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/89669898220.pdfIn PDF document text
    • https://simorgh.it/uploads/file/dawowosexin.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/nereba.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bozevudutedagar.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/92679404561.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/28577272548.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/saviganafax.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/71162491155.pdfIn PDF document text
    • https://palet-school.com/files/files/98809065620.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/silamafizujiwigi.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/73352872243.pdfIn PDF document text
    • http://horvathortho.hu/tmp/legulipuxeronarikure.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/74956061498.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17ef61d95---zakofaref.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/50852304215.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/sorewidopesupezatuzawef.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161507ae70d82d---64712589883.pdfIn PDF document text
    • http://doxetrilinh.com/media/ftp/file/75932460751.pdfIn PDF document text
    • https://stotex.rs/files/10698879900.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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 16600 bytes
SHA-256: 6666ce0a0fe242b40495e595d30bfec2fdf72e9d0da55c7c4ebd89b872fea9cb
font_01_sfnt_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10888 bytes
SHA-256: 529708674aa82724fe215045bbac63c08174e5fa74d4c808eee73d5b8e65fbbb