Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba2f36669acc05f…

MALICIOUS

PDF

95.3 KB Created: 2021-06-18 13:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 408d9edb0bbba9f41a6eff43a4cc1540 SHA-1: ead8ec2a064516f4ec202d8875407f688f8dc768 SHA-256: bba2f36669acc05f6edcdfd6d5f5300f464e0aad4152c61073c16c98d56171a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://huntic.ru/uplcv?utm_term=quotes+for+poverty+in+a+christmas+carol PDF link annotation
    • https://bistakalikotenetwork.com/userfiles/file/soxefexok.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a3c7a051---paruzorodekimewojutizalu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/krl6c2oko15o47fvp90orph4nu/1516314979.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff21ae45a8---zobefiwajajemi.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/suvipakajezobuzabejodez.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/q9rq87q0ep074hpk26gtkkbt1g/31770282783.pdfIn PDF document text
    • http://hasyo.net/files/file/wavakekopef.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/gebagavazonokomap.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/genugarijag.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6ef5e632---damarikawunuvige.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/xarubajofuvegazi.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/43287386969.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0d82720f85479dfe8e13ceb049bd3363/pijizogasabidunomipog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a075edeedf9---72036349342.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/09226550e393247adf227549b595befd/disomekiguvavanetuworep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 5360 bytes
SHA-256: fbc601bc8f3df5b26629654bcc554f10fd809b1d44ddc094e43681f5c9b71a36
font_01_sfnt_off00012649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12649 10748 bytes
SHA-256: 9e346827bbd6dd9842697cf391c99e24b2fa4bd510aadd853a4fa6cc5c9ce797
font_02_sfnt_off00014b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B13 16060 bytes
SHA-256: 4d366ad9796492105ae74b14b2d1f2bc035ce600696aee2727bc860947f90eb6
font_03_sfnt_off00015fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34