PDF malware analysis — malicious · 23886812eb0926b1

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 01:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 959099443bee4b3391e29378e23c87f3 SHA-1: b62ca3fb2ea2a4f7f6cfc9f384c563098e4f5b97 SHA-256: 23886812eb0926b10d8ae1b1053513d043ad84bbe1d394f74ecfe9263d5df34e

192 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The presence of a visual download button and callback lure heuristics further supports a malicious intent to trick the user into downloading a payload or engaging with a scam. ClamAV detection confirms the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

Heuristics 9

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://hourinkan.net/js/upload/files/wumamewerutu.pdf In PDF document text
- https://agape4u.org/userfiles/file/260541170.pdfIn PDF document text
- https://eccdc.org/application/webroot/userfiles/file/gabinetudajofipunuri.pdfIn PDF document text
- http://www.moyekolodin.com/files/pifupinabuzezovudagaxuvuz.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07ad6f2d0---85444635372.pdfIn PDF document text
- https://psystat.net/candyticket/uploads/page_images/files/59697982258.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b21aabca---70988510342.pdfIn PDF document text
- http://depcip.com/app/views/panel/ckfinder/userfiles/files/80245240632.pdfIn PDF document text
- http://szao-spb.ru/images/news/file/815141545.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb7bc3e29---dozidasiwulezokozedim.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa5439a72a---57797186903.pdfIn PDF document text
- http://www.ecostroyservis.ru/File/bikogifexe.pdfIn PDF document text
- http://4bx.pl/public/file/51596209650.pdfIn PDF document text
- http://hz-karavany.cz/ckfinder/userfiles/files/jesute.pdfIn PDF document text
- http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/26083565076.pdfIn PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d64acf571---govaf.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef3f15e1c---magoroxomefixijureriro.pdfIn PDF document text
- https://tselectromechanical.com/uploads/CKfiles/files/wokija.pdfIn PDF document text
- http://www.vinoplaza.nl/img/upload/files/83106148266.pdfIn PDF document text
- https://ajitcoatings.com/uploads/45742570018.pdfIn PDF document text
- https://innotek.vn/uploads/news_file/43792616856.pdfIn PDF document text
- http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a516e3171db---68636149455.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/042f7e2b830a6c73b8301d4735868f29/39330213636.pdfIn PDF document text
- https://www.ccs-corporation.com/ckfinder/userfiles/files/17613271043.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ac6f3c693b0c1150b69ec038ce248379/4944471358.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/caf3b204ab2026429a951b5f70e5461a/jumab.pdfIn PDF document text
- https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/c29b9db66365c38f93db0250dd0b29e5/91048895715.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=rrb+ntpc+previous+year+question+paper+in+marathi+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_off0000ee98.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE98	11452 bytes
SHA-256: `437087e37eafcac9d35ca64daff46bfb75d3e355b81a799dc962c0b6dfd807e5`
`font_01_sfnt_off0001091d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1091D	17324 bytes
SHA-256: `0890981483ab7e643a449fc88abb8a5f8a781cad9ae9ff3387e8cc911eb37e05`
`font_02_sfnt_off0001363b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1363B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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