Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e14c41a43bdd75…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 04:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b8765dbf1b8eb709bb25781e1eca9b0 SHA-1: b613d99c50ac087feb4cdb8614dec9bb2b808315 SHA-256: a6e14c41a43bdd758385254f2df9836606b93242a99461e6dfec1a995fb9d8e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8925

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=the+definition+of+a+sociopath PDF link annotation
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed028a98958e1f584a138d5c1218d1c7/gunivutufabamotajidirut.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/pudapeforowugasapopokirag.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/namizixuvazo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160807c0a80bd8---derujokusuzobidoz.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1e9370ca4d980ee78b7220d67c5c52eb/26137059173.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/sowanokug.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/7696228814.pdfIn PDF document text
    • https://invest.pl/userfiles/file/pukafasesipu.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d3fa243369b55d117eaf059cbec5c99d/dametajalugewilo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d26011d57---xumum.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/vawidonutuxanubujudat.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe640a33ef---94019645673.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/9352553805.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fdps01502c027qo7vkeb8jubtd/nedogonetuva.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/pilulegelaviwolasoj.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/52324247319.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/87389183896.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/kewalefipaf.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/zetosuzolajilika.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/17af393b5a78ea55b41377302aba54bd/31111185704.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/juniretufatekam.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/98990316021.pdfIn 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_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 18044 bytes
SHA-256: 967600d0f2be79f609d93492b8830ef2f32488aa5d3e271a3041bfa34769ff9a
font_01_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 10532 bytes
SHA-256: 465b496b259fa0883485bdcfee6c81597906279c08cede6cc95bbcfc66483467

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