Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c0f7addac4ad38…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 20:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 159d771566b177e732fe0d7ad4d70c55 SHA-1: 1f295ae3e8a21bd3429425b38cdc2014ebc0548f SHA-256: c8c0f7addac4ad38f249d92d8836debef194d47ba4f4dffe9732360126d8f457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://ajivikafinance.com/userfiles/file/tazajewukivedunulatirofu.pdf In PDF document text
    • https://gulf-rope.com/images/bulk_images/files/fonaxorewapuwudakej.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613958b2d4b6e---nakonukigemunimibume.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161420a4a79753---29958700428.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/69494814546.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613616e950a71---ziler.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/pexaketixafawuxid.pdfIn PDF document text
    • http://anm-av.de/uploads/files/69415113028.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c8cddab6---kenejewabovutadik.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbed2295ff---28876152870.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/denoramibumasilekedosek.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/debubimufifokexe.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/zafurafebirobitaso.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/88900719640.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/kijugeguxuzuf.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/68612799370.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/6445527435.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/nomuwajixiginun.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/94689644968.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/90760936303.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/zubatipidub.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/lodasigebotisur.pdfIn PDF document text
    • http://irths.com/upload_files/files/tagatupaxupuzoduw.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/tupejetovubojinoxosozusi.pdfIn PDF document text
    • http://gewald.ru/content/Files/45853056255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+moon+readerPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/pofuwifav.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_off0000b956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB956 18964 bytes
SHA-256: 972f02ec1cf38ce26b0eb13b4c8d21d669b5f36a4d2959d1a6e9a3428380e5d4
font_01_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10140 bytes
SHA-256: 1f13275c995c0d848c9ef1d7adde1015dd73231e44b7f6696f948991dfbf9a91
font_02_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1