Malicious PDF — malware analysis report

Static analysis result for SHA-256 273fb89eaafff0d8…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 22:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 58ff95dc517e78afd856fba5f48fa3ae SHA-1: d43fb88a2c15d14ef137ca10cbbcd6db039d5f17 SHA-256: 273fb89eaafff0d81edd3cc36b224e608ee5d01004e7f4c386e6cd6c05a7ce44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of an embedded JavaScript stream and a large number of external links, many hosted on compromised or disposable domains, strongly suggests a phishing or malicious redirection campaign. The JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=fox+red+puppies PDF link annotation
    • http://373113.linker.tw/files/17742959385.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/wemoxakobom.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3cac2c7ed---konogo.pdfIn PDF document text
    • https://cmf8.ir/data/file/12870324607.pdfIn PDF document text
    • https://tckontrola.hr/files/sozimulodirulijewilutagen.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/8961812151.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/95599145915.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/tazuvorejovegugemulesatir.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/56508160024.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bac1b6370c---tatazozeworapuxavi.pdfIn PDF document text
    • https://carlojans.com/cms/file/879642074.pdfIn PDF document text
    • http://w-mill.jp/images/file/45547793382.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/4896792731.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/disapuvomupaxipodurap.pdfIn PDF document text
    • http://skomi.ru/img/files/file/teravuvuni.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/81003215272.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/bukinod.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/xanopale.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/pabidiwenuveras.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070322037156.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/80777658770.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6206e4b75af3e9899abb1be656e6d655/24158156715.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/96449047285.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/50811136004.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/90912995269.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5fb63c7da8d3de6af5f2ee31c522e55/24365528211.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/92577893350.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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 15832 bytes
SHA-256: 8e5018ac7766ede592fa0d177e13c4356b1850ab98dd79655749d72c2335780d
font_01_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 10156 bytes
SHA-256: 90ea5f4ef9467ea97303fff922e2579eed32262a4fda83a8ce9f6fe6ceb86a0e
font_02_sfnt_off0000f4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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