Malicious PDF — malware analysis report

Static analysis result for SHA-256 79939e0095ca8940…

MALICIOUS

PDF

98.1 KB Created: 2021-07-05 13:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6772af2dbd3a6c297f895af8678f8ea3 SHA-1: 7bc2d6067ca41faeb993f6400f535d51bf33ab2e SHA-256: 79939e0095ca8940bfa63e699b9f24dd2029de3ac3a15faca42970d41b70ffcc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and numerous external links are characteristic of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa294028f7---33048848856.pdf
    • http://innotack.com/userfiles/files/76346236255.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zejezoxaroza.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/49406329427.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4f6335416---teguvalukof.pdf
    • http://sevoir.hu/uploads/file/tafikepi.pdf
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/37962342912.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/96962731658.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/67587088297.pdf
    • https://pjkconstruction.ca/images/file/verituwiv.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27dfd125b8567b7cd2c76051c174ba20/jaxavowobajabero.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/h32lo7llrjkvtdv75besi0sk3a/gakopipo.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3ff4dcb3---bizelun.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160761f9df3978---nabalular.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5f98ad9ec---fupole.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a872447d6---58422684710.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0m8l8j1l476rgl7vmdk1eis8ju/kivobumedowoganisasebizif.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72d1f12f5---45162667826.pdf
    • http://dmhu.eu/uploads/uplib/file/80865990828.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a4e23bef1fec11c0975c566508f42a39/wogezep.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qsa4lq06at84kqtt8jjkr3au54/80021831985.pdf
    • http://chandigarhdatarecovery.com/files/file/duburipigotud.pdf
    • https://kovtec.pl/eurostyl/photos/file/puwuvejajadagomo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=did+ares+love+aphrodite
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e64.bin
099eb4a20b2c1b7ab948bbba4d7b56f6512f7e79f6f0263c932aac7531e17392
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 16788 bytes
font_01_sfnt_off000149f8.bin
fd8313ce746e3419b093d8f7234c18062f4c119f78540bf5bf99e5538778a24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 10452 bytes
font_02_sfnt_off000161cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x161CC 16792 bytes