Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ea388e240a8f30…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 07:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d5dcd16f9340ef2de002777ed085ffc SHA-1: f3aa291ab2aeeeb4f760831bb023850c585fcdf0 SHA-256: e4ea388e240a8f301da541640710d234d8d364a949f6021afef41dc836d2c531
216 Risk Score

Malware Insights

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

The sample is classified as malicious by ML and ClamAV, with high-confidence heuristics indicating a payment redirection lure. The document contains numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish for financial details. The malformed stream length heuristic also indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://crewmak.ru/uplcv?utm_term=psn+store+apk PDF link annotation
    • https://nstoplana.rs/ckfinder/userfiles/files/7904687900.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/xomemozorafojikowasigeb.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lexiwani.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/zolomupimol.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/52176041824.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/robumefesevolitodo.pdfIn PDF document text
    • http://davcpundri.com/css/file/sipujomulipiregan.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wawotulitawilezufij.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/tekawoxezerumiwikuxix.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/41005073956.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/50267213382.pdfIn PDF document text
    • https://invision.buzyhub.com/files/34008731472.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/raziluwojebibetexugale.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ca92bdbf---62769842772.pdfIn PDF document text
    • https://timminsrenovations.ca/file/ZD8Me2FOc62mTxl3.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/lofozolepifejilitodipam.pdfIn PDF document text
    • http://edituj.cz/res/file/75023620452.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/jemifakisosezabisaxobe.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/861d76d45919584d577517e0d1a6e55e/bebebatelipuxodorog.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dexikenifurepigaziruzime.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135d170c682e---wexulikokokakarolumamunak.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/89960444708.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/perimoba.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/jatuzus.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/zosavakujosojavuw.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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 18112 bytes
SHA-256: a7fb9f040bbb6e048a05ffb4df973ec9052dac784b5f583f9a819344fd316f4f
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10200 bytes
SHA-256: 4d17f6998cdfabb5eaf58734a4f0eda6d9a991ac747c488166dbcffae438cb5a
font_02_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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