Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b101049919f7d0c…

MALICIOUS

PDF

78.7 KB Created: 2021-07-24 08:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d48b6784dfe6f65c3bee6f19e1ad04a SHA-1: 56c3b164ba1f81ba27e45b64c849117037169a4a SHA-256: 1b101049919f7d0cab4294bf111fdbebe622adf2d6ce27ecf08cb05172a9544c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and numerous extracted URLs point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608485fbe4c60---gezefarezugawosi.pdf In PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0ce13fdd0b57ed2fba8b90c06aeea2cb/fexid.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c970295e9de---62498360637.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f891311ea7---84796157703.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609495a9aae3a---80684978712.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/72403561072.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/wuxerakaror.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c88b8ffc2---dugaxoguvodupewadolodif.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03cd8c53c1---77739144242.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/cfud82m7fm0cta3qll379m7h1j/98935884254.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e7f14aee---telewoguvakexaf.pdfIn PDF document text
    • http://webursitet.org/Files/file/83443036253.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/15500578421.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/000481304d8d55b3b42a3b5f65cf785d/mukonosenalavijegufo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-10/20210610000113227708.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cce43010263---2450185739.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/87299921028.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/kktohlgdbs3nfrt6nmr0i4mif1/90652504351.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/c3v0o3441qe9ptn3iimj4piks1/dogekotujizekonu.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/14395447380.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210517/file/fubuzujavoton.pdfIn PDF document text
    • http://wisewood50th.com/clients/3/35/35ca2b70ae131fa39667c240906a3fe4/File/40170709454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=why+is+the+learn+button+flashing+on+my+liftmaster+garage+door+openerPDF link annotation
    • 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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 11292 bytes
SHA-256: dffb816b1b1d0b6b7aa8501844b1df5cd1dff7e2556a4502bc2743c5ef19ed24
font_01_sfnt_off0000e816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 16056 bytes
SHA-256: 8ae220e23e6dfc3dec9824ec8a7174ccfd790d58a4cbb4ce538bd07dd77fc74b
font_02_sfnt_off000111a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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