Malicious PDF — malware analysis report

Static analysis result for SHA-256 614d0b32c90de438…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 02:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42686d703883489c0622fbb4830c66a7 SHA-1: 1bc5cb53af04952f4048197b943e53acfe5f2be5 SHA-256: 614d0b32c90de438d7d44ac3f39523e34d4da502cd234529385ca3314cf3e339
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting and compromised WordPress sites. The embedded JavaScript stream, though not fully analyzed, likely contributes to the redirection or exploitation process. The presence of multiple PDF files hosted on various domains suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier clean score 0.2137

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.
  • 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
  • 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://yssnewlessons.org/UserFilesTwo/file/vazut.pdf In PDF document text
    • http://tele-klass.ru/i/upload/files/gupuropurozajobaxa.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65214ddb16---20473056133.pdfIn PDF document text
    • http://ingore.cn/upload/files/mafiwavelofemusituvemewot.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/14005415489.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/6379435306.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e27241748e---dapajutunezowoxuralesejek.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/ramigalubene.pdfIn PDF document text
    • https://totounited.com/contents//files/80396931398.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/32922221555.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/6229150434.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/sapuguj.pdfIn PDF document text
    • http://fxmeat.com/upload/file/82a8a61768fdca3f6fe0fbe328f1d8ca.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/wiwowoxulijokupak.pdfIn PDF document text
    • http://modern-pro.ru/files/file/tapaduvubarelasuk.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c2f1e5c9---23234987398.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f2b95cba---nebidunaravaxulisorox.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/41336453598.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/sifulolujetegogofesot.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/zefoxipefuzal.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160893c5e32cc1---jazunuwomezupijudu.pdfIn PDF document text
    • http://simoncaulkin.com/images/98341628825.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/64073872833.pdfIn PDF document text
    • http://garderoba.sk/images/_file/55132425962.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9cc158742---5599396340.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/94823631521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hypotenuse+of+a+right+triangle+definitionPDF link annotation
    • 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_off0000df92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 19072 bytes
SHA-256: 198aff396664c522a0bb95dbc0effbdf361d7ff23e701545519d69b9ba8ff9c0
font_02_sfnt_off00012912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12912 10980 bytes
SHA-256: dda4f8355b815c88769b218fe5c80a8337459a3dafe74c395d0c5ebe9a896d75