Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15786243249d997…

MALICIOUS

PDF

86.9 KB Created: 2021-09-14 05:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53c16fe5ea568ef6304a7e5e6098ce03 SHA-1: d73e4cca36816a3954611d4ca608a64ae3ed0adb SHA-256: d15786243249d997882d200b262d1a291ed16e6cdc3c4def2256fbcdee4976cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. The document body is heavily obfuscated, preventing analysis of its direct content, but the URL structure strongly suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://smidgel.ru/uplcv?utm_term=bach+siloti+pdf PDF link annotation
    • http://mastervin.ru/files/file/ritaxesez.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/22227813895.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/44492376569.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/249fvllhrathqcvt15p1dtk4pt/7261513320.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6f1f47590b611ef64c98bff18782f252/26715305136.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/27469328526.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/20072834087.pdfIn PDF document text
    • https://badrivishal.com/media/nevadas.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wususuja.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/zekuseviwebup.pdfIn PDF document text
    • http://tdbm.vn/upload/files/jisaxefu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3e05e6b1---moxolofuzanatiwow.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cd6703617844e0a71bf6e0a51fd6e679/detutobujafuzojeg.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/83524015437.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/kutekenon.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/19398769218.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-1/20210901115349281718.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/81617481704.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091007431814.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/91481345223.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruratab.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/welorumubumugaxi.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/gitavowogogenebobugomijow.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/rozidokukuroralu.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/zarixobajutuzeduzuledap.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/58650710287.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/2351633956.pdfIn PDF document text
    • 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_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 20972 bytes
SHA-256: 748fdd48b1cd3fac75b8133e7f9d14b6ba89a4782936d9083d3a36a870eae097
font_01_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 10436 bytes
SHA-256: 10006664f3bc6ff44091528b6b1b53d05e7f2dd16a9bd7ce7baad504e753d579
font_02_sfnt_off000135b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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