Malicious PDF — malware analysis report

Static analysis result for SHA-256 3179f75ab732dc2c…

MALICIOUS

PDF

109.3 KB Created: 2021-09-02 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee478465b541f525b6a092e327d365c3 SHA-1: f9a25994b0328398d5850420a247d9a77010a89f SHA-256: 3179f75ab732dc2c2d02cc215a33a4103ed90a0a55ce12858b7d2ce21d1c7d5e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent, likely for phishing or distributing further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nugumazuxeref.pdf In PDF document text
    • https://horizontire.com/userfiles/file/55903170908.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b273cbc10db---fefunom.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/wivurakadapaze.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/mimuler.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/36ac750b1dd8af6d6186d0da7c00ea49/74974162844.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/pozegobin.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9669dc8627---25758316009.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609633f3033d4---45366038091.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/32044891837.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vv8mmc6r02pt30lvdaafgk3pdr/vufobanudewuvelalebivu.pdfIn PDF document text
    • http://belst.by/upload/file/75940332787.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3784e531d---81121448873.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/87600466750.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/74144466621.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123521664b32---56070138402.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd037de44---31304478246.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/vekevoxadebana.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e78bc274131---90887561460.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2916940dc129439dcff48af8801aceab/talimuvesifojota.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e1e1dd6df6bad8240c5747ad5b01347b/15599348545.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8673c775d54f74541471e081666f1f6b/15996335187.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/kebejiw.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/11135734463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=anti+oedipus+capitalism+and+schizophrenia+pdfPDF 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_off0001408c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408C 11028 bytes
SHA-256: 80c7e09cb1e4000e3b66a46dfc6fb6f761b7958b56e41da573e0d8de2677bd39
font_01_sfnt_off00015a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A05 20316 bytes
SHA-256: c7c3ba9ed28b04c7579a47b05909e86d439f1f8e184025b4e3d76ec783449ab0
font_02_sfnt_off00018f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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