Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e8d61b142c0038…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 00:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d9af0440b0c5b75a7fcf6e1d9c99ac4 SHA-1: 8c48f02f5ab1fd5b1f9ed933a213c818da5b4d35 SHA-256: e9e8d61b142c0038f5dffae0da7002b4e600a32762a1499fdd18ab522b9e2a2b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which are associated with compromised CMS uploads. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

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 http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82f62598e---voneso.pdf In PDF document text
    • http://centralcogtc.com/uploads/file/41262992156.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/xodebenevitofugile.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/71429531667.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1lsu16m5fbliutkpulvoapanfp/gupijofemumabavejotexofu.pdfIn PDF document text
    • http://teraval.cz/res/file/30629099224.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/52959408552.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/41e670ca08f7e64f275f7d892b54183a/jakuzanidaginudo.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/78380900304.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/4550947915.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c535d40123f---vakezalozago.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cf1e5utrh6oj9qhuh4u4j1uvd1/geketutozexi.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49e18c83a---vosaf.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/rugefojis.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zimadagasaru.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/pekisivaj.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/mododesitawipos.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b0ecd9d47---57856423657.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/54124146088.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7914a838708c45ca55d0bc757bc630b2/loserisavuzu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7509c8c0b---32581968621.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9684738c7---5890684207.pdfIn PDF document text
    • http://sam-global.info/files/file/refimudolapa.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/22508068663.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/pusukalekotexuxenebun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=structure+of+active+and+passive+voice+in+all+tenses+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 18296 bytes
SHA-256: afb28ea94918d1a4072dcac0e304e610cffc251f8412cb23a18ae02eb45b662d
font_01_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1