Malicious PDF — malware analysis report

Static analysis result for SHA-256 607fce7e4bac45d5…

MALICIOUS

PDF

94.2 KB Created: 2021-07-14 06:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 18c562338a9a71322a7d6aee26c0af97 SHA-1: 75592da60c44f7933fd76d3e226ff10c7048c52b SHA-256: 607fce7e4bac45d50e8a6610d204645a97760eafafd25d640ecf930ffd16085f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt at SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gastrotest.co/ckfinder/userfiles/files/13317673658.pdf In PDF document text
    • http://sammyurias.com/userfiles/files/43928880613.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee04e5bd68---lewutegepojekonuza.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g7l49m12h021uod4dvksuu7p99/kitozamedewanajup.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/7362273773.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad65c5bec26---48811906327.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/relujozogitusajafup.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b95be9fe5---96466755217.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/81402904594.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3fa212d2---bubokenojivupakid.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/83798069270.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c503d26bb2d---63742886074.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/d2sudiue4mn9h97nu9o15curpl/2447084598.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/fee534fa4766db2f5eef9a17b03927dc/16929395119.pdfIn PDF document text
    • https://wecareprogram.org/images/file/paxelefoka.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbed623105---koxobapekigezobowarixula.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/85743750078193d2de3cfae8b8044b46/lewikexilumowaka.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/cf46c8a1f57d08bfd88eb1feeb9d280b/tepatapisejolufebibiletef.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/nibamowomufazaxizitolus.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/71483939865.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/81016385245.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/99357239089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=house+of+the+scorpion+pdfPDF 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_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 10600 bytes
SHA-256: 1f4b7e2d0b101a5a41d6a7490a34245c2fb0c9cdbb281ec9ba77c655aa398308
font_01_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 17368 bytes
SHA-256: 9ba7e48bf5e4068b868302bc7e313be65d7e88b3ed367c84f89a8998b925912a
font_02_sfnt_off000153d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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