PDF malware analysis — malicious · 6e0587c7955fc64a

MALICIOUS

PDF

90.0 KB Created: 2021-09-05 11:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04

MD5: e2cf594b592303c9fb53ea7c0d42dd3e SHA-1: 21504b70e7fe2e53734d424dfdd8149bc0ac18b4 SHA-256: 6e0587c7955fc64a6f7cb35e4e5c6a30c331430d3b7f5ae5e39da601c811cef7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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 http://oprandi.it/userfiles/files/34790317040.pdf In PDF document text
- http://bmsorganica.com/userfiles/file/86134733795.pdfIn PDF document text
- https://reitinguok.lt/userfiles/file/fonoladinusisobejojitu.pdfIn PDF document text
- http://dailymaydemtien.com/userfiles/files/69386605539.pdfIn PDF document text
- https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/763ec9bc77f54d76ae3e9dba91807fe8/xulabadubaluxeravul.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/26683132661.pdfIn PDF document text
- http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/16673379406.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qhnoee1qdjk65rr8ajkvq2qe5o/wikenoguzerazewif.pdfIn PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ibekboqcg1c15bof2dnljk829r/37934331954.pdfIn PDF document text
- http://swhos.com/upload/files/ratigokewaviki.pdfIn PDF document text
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/36to4d5p90r46fc1h6a169l5kv/38870568877.pdfIn PDF document text
- https://www.nevjegykiraly.hu/userfiles/files/fopuvudake.pdfIn PDF document text
- https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c45dff19---fowiwijozas.pdfIn PDF document text
- http://joyear.com/ckfinder/userfiles/files/wemot.pdfIn PDF document text
- http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2a58db56d---jenelesabara.pdfIn PDF document text
- http://kramnyca.info/img/upload/editor/file/64405332094.pdfIn PDF document text
- https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b84771e7da0---59348863434.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c050d7b5fe3---69056510275.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c437a43d52eb891b7ec34c303b3372ed/45160681208.pdfIn PDF document text
- http://esistore.de/userfiles/file/66901930022.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7a7dd7cc---suvigewaguf.pdfIn PDF document text
- https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e33ad7e1a0db02a335d61562a81236e7/76940145618.pdfIn PDF document text
- https://debcopharma.com/userfiles/file/bimitexoj.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=asus+n300+extender+manualPDF 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_off0000e4a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4A1	16060 bytes
SHA-256: `64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973`
`font_01_sfnt_off0000f9b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9B6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000111cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111CD	10676 bytes
SHA-256: `dd7bf482917c8d452fe408b09e37551f924181312fb10d0f5b5b02b89ae4d6a3`
`font_03_sfnt_off00012a66.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A66	18524 bytes
SHA-256: `a9340d7c6da2e2f5f7c44e4cbed2175af1ebf259aebb4fb050aa545028dd9591`

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