Malicious PDF — malware analysis report

Static analysis result for SHA-256 375699f4d887b52a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-02 12:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47a93f0e2be89bc33dcf005a9bbddfd1 SHA-1: ceb70df9ae7d2843d3f8c0e6f69368a9d33d4f1a SHA-256: 375699f4d887b52a1b452a1a7f93fc72fbd68996a02dd42c14bce789478146cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://monroe74.com/clients/871877/File/xiraxamigudiwodesegerofi.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08aa0873d7---pubitew.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/2t6atfd7fkr05m4ejm5ghpsip7/47153685962.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/19706555121.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/74735258141.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/mki5hsh0sf70ntr1g07q0a62a6/45351632290.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/46904758008.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b12443bb49---93616140009.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160854cf52484c---jizosebe.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/19809313206.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/powuxamukofapo.pdfIn PDF document text
    • http://alltechsro.cz/files/komubuziloratubuwerelop.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/jebitilugewusevujulituj.pdfIn PDF document text
    • http://4bx.pl/public/file/98542846390.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/90f54084beb2c1b6dabafcad435b1ba8/62508802692.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57d1029bc---tivokasama.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab910eefc02---safamekuxawowokovomefog.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f1d46a08e1263f1330fecefa0027c943/31582374738.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/11772139579.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/dakejasamipoju.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/94679156886.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/lewupitamujokuva.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/budamade.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/33551564268.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rugusizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=design+of+industrial+wastewater+treatment+plants+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e712b96e6bcb2328a9def3e2a0f965d8/gapanixaxejotufabep.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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 11028 bytes
SHA-256: 9b201c29bc9743784c4370dc83f1723b539582aa8514a1dcee2be4a039fc3ed6
font_01_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C41 17988 bytes
SHA-256: 31fe5a44edb1ced3d139cfb8fc6e531df44335a7beb60eea030adc6c5c898fdc