Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d303a7ec74e3b0c…

MALICIOUS

PDF

86.0 KB Created: 2021-08-17 07:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 855b4b2dac8860615ceff222e6dd0e3e SHA-1: 17e0da74b396b66340e5cb7f4a0a7411cc23238d SHA-256: 8d303a7ec74e3b0c9f0a22df8b737e0ad357efe77b81e73e41d4a0b6a262cfed
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pet-fashion.ro/mm/file/98666545616.pdf In PDF document text
    • http://hodinovysoused.cz/upload/file/nekateg.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087e488ded62---42273575507.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e1fade1e7ca0cddbec786eac44c9aa01/184898421.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/saf537k8mijfp1ckc5pgciumnk/85544898465.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/wasagesiwore.pdfIn PDF document text
    • https://educhina.mn/editor/files/dejesunuje.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/numep.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/66082562817.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b873fb52ea64605b919bbb84ea005ee2/71326907180.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7l70ht1tgglg14bvq7iiu26hl4/zamozom.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d4024627f6a---16077731079.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/e9g8df0m8v4r7o2amhth7ffeh3/20683203876.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/nonikujozetiw.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607732b28b76e---78003941412.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/gorugonivujes.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/96969110049.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/zakerefuna.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508071723173.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tidm5ils5h2hvubisjoglsu3vq/88065425964.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/kosafurizekakam.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4479e7fad---20136450026.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3db78012c---guguparivuxidaxipimam.pdfIn PDF document text
    • https://longhoang.vn/upload/files/wivosofigogugiwefupo.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/37cfdfa83164c4420e17d32e844d3542/38914645083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+stranger+camus+pdf+matthew+wardPDF 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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 10960 bytes
SHA-256: 954faa414b0f2f16bf0fb62650913dfaae169e0c04fe84b7887cb227a43ec8e9
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 17164 bytes
SHA-256: cad04ea3a72e0896ecdae6583c7fe554313f76b558527de7d9c6134934aaa121
font_02_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1