PDF malware analysis — malicious · aa95c093b3a9e271

MALICIOUS

PDF

108.5 KB Created: 2021-07-07 20:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 1f76e1effed91e72ac1f03110ff1d6e3 SHA-1: 225515fd1468f6e055974abbf646f17cb6adfcba SHA-256: aa95c093b3a9e271d0de9850361b2ac1908980220c5982cfa546cf091dc77e32

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a phishing attack pattern. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9797

Heuristics 7

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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://prtourusa.com/FileData/ckfinder/files/20210628_88B6EE0447CC2937.pdf In PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c76c8c2b2---69908941713.pdfIn PDF document text
- http://naturallabs.de/userfiles/file/zijafaturojepimirupewu.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b988c428e2e---54354909360.pdfIn PDF document text
- https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8da585f32---runuxinakikono.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/080a7cee69e19fee92783d34bd8c3b78/28978601954.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e397d3cd0f1f55c77955afda18b4adeb/tobamofatotuwofejopijavun.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0fbde7b61---rifixok.pdfIn PDF document text
- https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fda377daa8dfadc5724b0b64fe019f9c/36330887655.pdfIn PDF document text
- https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/8rbqi23srg6eg5pkl7p2q1vph7/53627832162.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/78af3e5966fac99e55bfe2e5f353926b/61004966970.pdfIn PDF document text
- https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f83af54a43dfaec1b19d71ffeda03562/liwoxipaku.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c4df8a68c3d---5240152184.pdfIn PDF document text
- http://1-cx.com/ckfinder/userfiles/files/jefakiwijalukekerogef.pdfIn PDF document text
- http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1056f2a1434b04d5999d32da414707f0/gunujomo.pdfIn PDF document text
- https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/71c6e8de6851d90fc7d50d30f1500e36/jisusirezoxuriferunovinaf.pdfIn PDF document text
- http://edumedcare.pl/upload/files/72155321727.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608328a9b5317---goxaxexesekurowiz.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4ff6f691---divubuvotis.pdfIn PDF document text
- https://ms01bet.net/contents//files/pakaduvasefupe.pdfIn PDF document text
- https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/09b6650f00a7fc05e94780ba85b0496e/mokunuwekamagel.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d7bdd04142cb2bb81792cd13492311a5/gixusunalimelenusupujixap.pdfIn PDF document text
- https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jkea0h0s250q2r51l3cnktkcl0/30649439149.pdfIn PDF document text
- https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160caa5c0ea086---42920493153.pdfIn PDF document text
- http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbfd2d7638---kogupi.pdfIn PDF document text
- http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73b0c0490---30966158204.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chapter+9+cost+of+capital+solutions+gitman+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.

Filename	Kind	Source	Size
`font_00_sfnt_off000143ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x143EE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00015c05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15C05	11364 bytes
SHA-256: `c0cea98191741666e624310f273aa782768159ab0170b11dacf268b244eb8869`
`font_02_sfnt_off00017666.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17666	17488 bytes
SHA-256: `5fdf318c0d9d2b345d8d4335eeb8ad29f684a0407810b73036fe80dc58389c5a`

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