Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9a150ffdc0e701…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 13:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b068af7c7975b60d029dc84de9593382 SHA-1: 8bebabd28c001b1c164cf67061970bde904f378a SHA-256: 8a9a150ffdc0e701c9130f694ca86b16a75465b4cdb6e510fa94df0a4d3acf0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6ba7c89c2d19565027a43244b4f043a2/nudazadakamixetakapamo.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-22/20210622143941169297.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/91352244785.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/pubuxopovujabezuxoxomunu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/edq5fdgraikc58ukch2h6ujbv7/94081147227.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc722de311---92634476461.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/tefaxakoturex.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/fujorebiwikupuna.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/mepukexutejixotewajupap.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cd30e3273a8dcc2e40f57030e41d648a/xuzebur.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/sabonez.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/87065706640.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/e7g8dev8p755jgd5hhourfpbn1/gufefuravol.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63234d61b435eb7b143bafd77a5e7b82/28113427773.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3359209874---56223549953.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/34479196252.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/burivupufemevuwo.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/78222368194.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fe6c0175---daxanaribowunir.pdfIn PDF document text
    • http://seritour.com/rsm/files/85956487939.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/difugejagigewux.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/94661925716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=rover+75+v8+manual+for+salePDF 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_off0000c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FB 17196 bytes
SHA-256: c049b0e66a32c2a4f87fe1360f12fa0088366a3e110dbfeca8c492c1ac1a82f5
font_01_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 10788 bytes
SHA-256: 9c44736b3bcbc7aa453ee591869c459f60b4d56e6c4400ef82f2b5077570ba7f
font_02_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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