Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c997f4a7d8e016…

MALICIOUS

PDF

109.4 KB Created: 2021-07-03 12:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7996102ee2c3abd2518252008836e901 SHA-1: 9237fd490800566eddcebc7b5f5bc0a13a980f6b SHA-256: e4c997f4a7d8e0168a78ccac44a7177ce56bc304f39c38ebcb5256067be097ae
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed a link farm structure with numerous external URLs pointing to various domains, many of which appear to be compromised WordPress sites. The presence of these links suggests the PDF is intended to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4560

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=airpods+bluetooth+driver+windows+10 PDF link annotation
    • http://cbwmd.com/uploads/Files/sevedomas.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210613210548.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e5162ed63bf1b4cf6c07059319515418/80125834349.pdfIn PDF document text
    • http://teplospectr.ru/images/files/69132840748.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cee438d22---73698989312.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8f730fa94---56597296248.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/96471322528.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/129bbe34c084e3f0f31e1cb28213aad6/lamufavubusamafiwade.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/lugubovanopup.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4fb0de7a0---zurotojuzidalazudob.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c458898f2---lejidisujerazebizadalidap.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/59635239069.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/l18v4hlp801l3prtqlr488qq5g/dapirufobogutanemawib.pdfIn PDF document text
    • https://maisonforville.be/documents/file/29255494226.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/luwaragubime.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/gilunu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160774fe166458---bogifaril.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/muzaru.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160916bfab3707---57157682444.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/6t1tp2c9acgoi1n3m1e65dh9pl/43238332012.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/221246936.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f8a671fb---57914050624.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1ca35e9d---xodavabebemizogirefe.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/g795qqugc2cion3dfh9qphocmi/zukozovoxoxapixetabafur.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf1e9ba77---fukoxisapekuremametijuvo.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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 14576 bytes
SHA-256: 9806ca805b5b6b16db1adba30f30ae7ffa1bad0a875d8c604646b1890cfbef98
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 10876 bytes
SHA-256: a8ab2b92cb302b7386f0bfccc539a318626ee69dc2789f4f1821bed01f78bb67
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 51444 bytes
SHA-256: 42ecda5a8517a9220685abcbf217d1d8f69eccf5e449e94283612ddad8975a2b