PDF malware analysis — malicious · 413d09796c1a4d70

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 12:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 3be2698df1da2bae899ce242f135e79a SHA-1: 82aaa7520f0338d077e6613e1b04589c338d1799 SHA-256: 413d09796c1a4d70bed7137a74fcf1defa3c1768fab3c3d95459ed23b00f4b43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure and URL analysis point towards a social engineering attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9900

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://adian.eus/files/galeria/files/64647700988.pdf In PDF document text
- https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/214498d089e0ce939d37cc2b7e97792a/lubexakupi.pdfIn PDF document text
- http://nhuaduongnhapkhauaz.info/upload/files/99302397991.pdfIn PDF document text
- http://brightwayconsultancyservices.com/userfiles/file/fefakexopurotisugoraxu.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06ff154800006d34ba3246b6e586f640/59524986585.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8698ea7fae5a1fba56a7bdad07f8de9e/zuwasidajewukogamadu.pdfIn PDF document text
- http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609752953b294---86972962166.pdfIn PDF document text
- http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad2155025---mibepaxorinubogepegake.pdfIn PDF document text
- https://wecareu.net/ckfinder/userfiles/files/pibaximukuteposenagexiw.pdfIn PDF document text
- https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d33a10f3411---31066739551.pdfIn PDF document text
- http://sictombbi.fr/ckfinder/userfiles/files/bugovigilirakuxi.pdfIn PDF document text
- https://g55net.com/webpagebuilder/ckfinder/userfiles/files/bofilatosimesepivejixi.pdfIn PDF document text
- https://fenixfalt.com/userfiles/file/favexemanebode.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/42db3719dbb17721def0ca57ecb4d040/xosobuv.pdfIn PDF document text
- http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93a8934b96854d6333a86ffb5d147a78/60446520745.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8cad0cd95---rinajanejepupefafogurele.pdfIn PDF document text
- https://expobar.vn/app/webroot/files/images/pages/files/12977728162.pdfIn PDF document text
- http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609879d098333---95926924345.pdfIn PDF document text
- http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d78cc0d0c90---73513779150.pdfIn PDF document text
- http://eltprof.ru/userfiles/file/xirijavamululepubulunubet.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a429819d0b0---goxijibasokukomapedateg.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846df406f54---febaxad.pdfIn PDF document text
- https://ringid.vn/ckfinder/userfiles/files/rimenadafudutowul.pdfIn PDF document text
- http://jubileejec.com/userfiles/files/tusavibepufej.pdfIn PDF document text
- https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/f649e348c3d6080710aafefdcaa69e06/70107255919.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b503dad136d---58467616472.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bitwise+operator+in+c+programming+with+example+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_off0000d7d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7D2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000efe9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFE9	11308 bytes
SHA-256: `41b6befc2d696bd60776ba4819cd17db55383c2e684276e1869df0f20441b63e`
`font_02_sfnt_off00010a34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A34	18156 bytes
SHA-256: `d84c644e77109c291bb0e4fc3588b942b5d56670e16da94d0dfc0b82e6b59804`

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