PDF malware analysis — malicious · 06607afc742590cb

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 08:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 9c2a45addc64c0ea3611dc26d11743d4 SHA-1: dd32b262ebf218c94eefe0d3023da65b1f7097bf SHA-256: 06607afc742590cb52d92618c55d254e04ffd489db66c981583ca3ec65e5987e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and link farms, many pointing to compromised CMS uploads or disposable hosting, indicating a redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9709

Heuristics 6

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.
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://birdwatching.sk/media/file/40014087165.pdf In PDF document text
- https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/2qr235proi976f699if0tmo8rh/wogiluxuzuzaki.pdfIn PDF document text
- http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b662141b159---9995848857.pdfIn PDF document text
- https://cancelaria.pl/galeria/file/vuxusijaxasufijubibenujol.pdfIn PDF document text
- https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c525b2720071c3cb33c39cfd819d41e/3387447174.pdfIn PDF document text
- http://rcsiprojectracker.com/userfiles/files/suzikojutosoreduvikuzi.pdfIn PDF document text
- https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdfIn PDF document text
- http://spreewaldatelier.de/img/editor/file/dixowobix.pdfIn PDF document text
- http://lorichphoto.com/pictures/file/xolupamubarakumejewopaf.pdfIn PDF document text
- http://donghocitizenchinhhang.com/uploads/userfiles/file/zunepon.pdfIn PDF document text
- http://fusheng-vietnam.vn/admin/webroot/upload/image/files/47135033601.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b9f37e9b---34978554987.pdfIn PDF document text
- http://pc75.net/upfiles/file/1623093553.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d74a110c02251dca973c87cfc514bfeb/sabixobusir.pdfIn PDF document text
- http://keralabiblesociety.com/fck_uploads/file/51384993997.pdfIn PDF document text
- http://poddertradingandindustries.com/userfiles/file/82759201153.pdfIn PDF document text
- https://atkarisuli.hu/userfiles/file/32953916091.pdfIn PDF document text
- http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210630052356.pdfIn PDF document text
- https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e32e9a98f8d663c9998147c57eb55ddf/devosekebi.pdfIn PDF document text
- http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2cfcdd00---94858536437.pdfIn PDF document text
- http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/sejopuvuviwopufadape.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9cb8b3485---81485502745.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b56ekdcb4lsmvm2b7j09qj7d7/jakigeromutetitenuseru.pdfIn PDF document text
- http://divapharma.com/uploaded/file/zegabilebuluwanudova.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/18832c6f096e0bc21b54f6b3b80b8470/65477726670.pdfIn PDF document text
- https://cs168.tw/upfiles/editor/files/jujoxumufemasor.pdfIn PDF document text
- https://madeinstlucia.com/userfiles/files/dogopikexovilafeb.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rrb+ntpc+syllabus+2019+pdf+download+testbookPDF 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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000bde8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDE8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d5fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5FA	18644 bytes
SHA-256: `9c2d5a154b5008f1b5891e2834547285e7a377c89b4f6515adf67e27ae728eb4`
`font_02_sfnt_off000106b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106B2	1680 bytes
SHA-256: `6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc`
`font_03_sfnt_off00010ea9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EA9	16128 bytes
SHA-256: `e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426`
`font_04_sfnt_off00012408.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12408	11560 bytes
SHA-256: `6cfd8046a8dd363b14bf75249bc7a5efc00731aef38959749c93172fe8e63f6f`

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