Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec61939bab26093b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-28 09:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ebf77f25a32ca37c873e1d313aee1d1e SHA-1: 281d48a2cb034bd5606b9ad29d70642f2675c9f1 SHA-256: ec61939bab26093bb9009b3bc84bbb70a371cc6c52bab61a53ab0a9a5a96d5cc
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The embedded URLs are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://adria-ex.com/images/blog//file/74102464460.pdf In PDF document text
    • https://menlopark.com/wysiwygfiles/file/62167656326.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/45800500531.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f3c23674e8fa1d764c289de433332413/nijapi.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/jebifokuxelugarazewiz.pdfIn PDF document text
    • http://roocenter.ru/upload/file/80910365977.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010ed0db1a---pototuweg.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/fifuvuxifumino.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/vonazilalesafakupo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/63314917209.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3069834383---58658416970.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/676bc2e1df1db99c916510dbd39c8859/1281665081.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1b140d252b7c2079cd643997c8ccf846/38420788704.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/nawovevirimuzu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/zazumijoxupebojam.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/radumixulegimawagojubad.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/tejodemavuxamela.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/76728633459.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/22969168006.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/gagukejibinepa.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac5c71821---pafunazepukaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=malcolm+in+the+middle+season+1+episode+2+dailymotionPDF 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_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 10956 bytes
SHA-256: 8e3fba3977baf507da57621cbab8a5fa9682bc4b8a91c568753e6c3af652a416
font_01_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 17032 bytes
SHA-256: a69adc63caec829c9538e757a535a83da43f32c9cb52ca0093a84233058191e0
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1