PDF malware analysis — malicious · 1f9f659704bed8e5

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 05:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 8293048f3b7377b42a8da3a17c8a9493 SHA-1: 49927cb7d440c37008112113fafe1519ff283c77 SHA-256: 1f9f659704bed8e5d7998b53a59fdf51d0eff400be9508a0af8999fd898c4d9c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the structure and URL patterns suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

Heuristics 5

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://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841a025789---nikafirinowogonimazoxo.pdf In PDF document text
- http://djarkitek.com/temp/vinney/HTML/userfiles/file/43536401355.pdfIn PDF document text
- http://ukrainski-rosyjski.pl/userfiles/file/buxoseni.pdfIn PDF document text
- https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa345681703---jikijaronekisebutopuleto.pdfIn PDF document text
- https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4530a41363---19017350465.pdfIn PDF document text
- http://natproperty.com/userfiles/files/63230173748.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/7b172dd3ff8740d51e419cb1ca14c069/vafiligipadizomofe.pdfIn PDF document text
- http://caratow.eu/userfiles/file/2193411349.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/7b1d6bde86a77daff2cc4ae75b7d0745/tofifebejijodawegap.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab6ad7a8bf---xixanogur.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/17244932832.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070445ecea2c---82523009575.pdfIn PDF document text
- http://ngocvietbungalow.com/upload/files/disewitodugipewim.pdfIn PDF document text
- https://vildmarksjagt.dk/userfiles/file/mefogonifugukufalefep.pdfIn PDF document text
- http://apcmagon.com/userfiles/fofofebumir.pdfIn PDF document text
- https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a1b2f807c7302a34e95113a252aa0bb0/gezapabelinixojida.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c235b2a663c---jawawufikuguviliwinuvapu.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3746140058---fuzezon.pdfIn PDF document text
- http://co-wemart.com/careeruserfiles/file/fijufororigelu.pdfIn PDF document text
- https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1504f9b554236f43ab72fbdadfc85e04/51047290057.pdfIn PDF document text
- https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6b5f6a33e933f71af8a5271873e50a12/13595042534.pdfIn PDF document text
- http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703ae59dac2---girogolatobewidokeju.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160739282e6a5f---34919852569.pdfIn PDF document text
- https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/47617880375.pdfIn PDF document text
- http://tiurll.com/1lz8krIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=chak+de+india+movie+download+tamil+dubbedPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e3da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3DA	19012 bytes
SHA-256: `e475d3f41697e85bb1a421755dba1b0404210b7c9f42463b8c5559922110e5aa`
`font_01_sfnt_off00011480.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11480	4376 bytes
SHA-256: `e420f805aaf172e1270297b554b1a80bb6545b63ae0656a6c0d92c5501b78700`
`font_02_sfnt_off0001250a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1250A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00013d21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13D21	10760 bytes
SHA-256: `d6218dc83ebf1737dc2f78aa85cf6d121b10945841a38866564535aa64aad9f0`

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