Malicious PDF — malware analysis report

Static analysis result for SHA-256 55325f955616878c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 13:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc151a6984ba924041ff7b82de69ac20 SHA-1: 1d8b347535cb73f9d2e54d8ba1a9a5e448edc27c SHA-256: 55325f955616878c89a51087985e2b01d08f5fd3493c9d624dbd26ca38b397dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS uploads, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e1ovl5ociecc11s5fqvpb6oq55/pemibowabapemomuten.pdf In PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c98687fc8---43159339702.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/xumif.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/58279507801.pdfIn PDF document text
    • http://budka39.ru/files/jirotujasamepufale.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/zezipejejaposuko.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/71793487172.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/lenaneri.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/jujekatusorewuxelazura.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/limamire.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/21504958880.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/gilavupiwu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/luleponilev.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/62764624639.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/55976016537.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/jajivawufefojujedag.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sumilu.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/redamonukibigufeviguz.pdfIn PDF document text
    • https://sharenkon.com/files/92954335976.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ziwugodot.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/35431281665.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/mubug.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/95949348355.pdfIn PDF document text
    • http://seritour.com/rsm/files/pekatenevef.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134146acb366---gosapozekuvu.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/48912047438.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910045127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=como+descargar+emulador+de+xbox+para+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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 11132 bytes
SHA-256: d88124611016f0b1f1380ff130e7c8fc2cd7564ebaba7159ec23793d1fa76643
font_01_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 18924 bytes
SHA-256: 24e07fb00c8cd03cc50a839868efb36ecef115036149f758c80e06c1c38e4b75
font_02_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1