PDF malware analysis — malicious · eb8ef718b136c6d3

MALICIOUS

PDF

73.7 KB Created: 2021-09-15 14:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 66d1b039e8154b5201c80cef2306756e SHA-1: 5062194b47009fafdb658db16218c642c2bad585 SHA-256: eb8ef718b136c6d3375c28de47c0aba606bbf7faa84d58ef4d7f3f5f443f5f4d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents attempting to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://dakotaterritorydevelopment.com/ckfinder/userfiles/files/38153738818.pdf In PDF document text
- http://doingthing.com/downloads/blog/geust/files/budubolaziji.pdfIn PDF document text
- http://studiogiovannone.com/userfiles/files/nedusapulisimuporo.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614048fa22724---vekopinaje.pdfIn PDF document text
- http://zjbfjt.com/upload/files/sazilabivedewonizoruso.pdfIn PDF document text
- http://eyupsifalibitkiler.com/resimler/files/webavevakasizina.pdfIn PDF document text
- http://savalis.ru/userfiles/file/zovufatabikupofuzuwer.pdfIn PDF document text
- http://studiolegalebisantis.it/userfiles/files/43289727559.pdfIn PDF document text
- http://onroerendgoedindex.nl/images/uploads/jojopomivalod.pdfIn PDF document text
- http://denge.aero/upload/files/duneterarolu.pdfIn PDF document text
- https://tailormade-sales-marketing.com/userfiles/file/sipikofimuruxip.pdfIn PDF document text
- http://qdxqw.com/uploadfile/file/ruganebepilomavuwomewetig.pdfIn PDF document text
- http://kuryakyn.ru/userfiles/file/zixigenorimotote.pdfIn PDF document text
- https://kindeeyudee.com/ck_files/files/22198946414.pdfIn PDF document text
- http://www.gabrielamaciel.net/images/content/file/sozamozid.pdfIn PDF document text
- http://www.allatpatikapecs.hu/images/file/3845924467.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135bebf604ac---raxagufubimaxolepax.pdfIn PDF document text
- http://njbeihang.com/uploadfile/file///2021091403042782.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f8449cd91f68b9f80b20ffba1d4e8727/78019677455.pdfIn PDF document text
- http://seasonsblinds.com/uploads/ckfinder/userfiles/files/31356671622.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc3e3cc9a---71406484731.pdfIn PDF document text
- http://nexxosrealty.com/userfiles/files/netujoboxafunadepo.pdfIn PDF document text
- https://socardan.com/userfiles/files/nufiwafibawalanifazaduj.pdfIn PDF document text
- http://samocvet.org/foto/ck/files/fejefogemesufiwaniwom.pdfIn PDF document text
- https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/fumezavaronitoje.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=speak+text+on+androidPDF 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_off0000be53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE53	10440 bytes
SHA-256: `c05caeae96e86af76cff27c1a1cf92abee5856a79a75e0f7860b94a49bedd9e3`
`font_01_sfnt_off0000d621.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD621	16896 bytes
SHA-256: `325b18bb386eb999443b49db144285fe1dc11f68872603fd48bcaa8857535aeb`
`font_02_sfnt_off00010148.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10148	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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