Malicious PDF — malware analysis report

Static analysis result for SHA-256 7147183f19ff9a55…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 01:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fa836a0a606be14f1ab562c532b3be7 SHA-1: 16c157dbdbea20ce97c699b78b421972afd71045 SHA-256: 7147183f19ff9a558d4b87f86ed1dc9563608f7a9049588acba68325e4697419
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The primary attack pattern involves luring users to these external sites, which are likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=always+be+confident+in+yourself PDF link annotation
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073003653351---pediwi.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/17026974412.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160df8d18efe88---52759308493.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/lakobipazenegalaxadawa.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/7677098155.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7955386a---ronodosebikufiluwobulumu.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/dosedinumazekad.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/adfaad32ff59395f4af31722d6e45087/27190856522.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df927d4ab8c---beruragazejivetakup.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/72ej8c6ck7r47lhlp7pksamc13/pugojituxun.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724898ce65c---mezubebigos.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/nalejopejetujimamew.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/77227689321.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c238e9f0650---kowedofalimaw.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a11ad22d177---xifexegazefama.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ad714a8382101873a3a270b97ccbb2be/veloliwumupema.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/klrhrauddfis8lkip7a0p2d3hs/fufinukado.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b10a6ba5---dipelagadexavegipukeku.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0070906d66a5c71b0f1d905926db3681/dovexopezuxikageko.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38ca27d01e9c98ac001679064f18f310/7744792937.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/de26c9e63ebc0246770adf8a0233c03a/lofodafijigefisa.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/23838086887.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/40972811768.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/42968953448.pdfIn PDF document text
    • http://chikatere.com/Upload/files/59014975010.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_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 10888 bytes
SHA-256: c16f58ead9dc4159d54eedcdb6dd3ec13eac3c96f514739dc5602d7e26cd142e
font_01_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 16668 bytes
SHA-256: 55c365ada9b0496fe2d4ebb51cd281e5e811e9ad5b9406f2acd43dde85603992
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1