PDF malware analysis — malicious · 43c75b762545eb1a

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 21:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: a33f6a6ab63c98ebbdbc92138de5f13a SHA-1: 60d63febef73a0ec27b9fec972467f9ee888c18b SHA-256: 43c75b762545eb1a0d7a442e19c41c439296d7318cfb96b847a6c7fe44f80f21

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised CMS upload directories suggests an attempt to lure users to malicious content or phishing pages.

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://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d79d9e3e---majanometu.pdf In PDF document text
- http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/8235120896.pdfIn PDF document text
- http://chokmanee.com/userfiles/file/64419944912.pdfIn PDF document text
- https://uleshuzatabc.hu/files/file/dijixikexunadelotu.pdfIn PDF document text
- https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc50030dce8---3556213770.pdfIn PDF document text
- http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c900c39ac85---baberarag.pdfIn PDF document text
- https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/luec6dvo770mk361qmq7vev0nb/14080780643.pdfIn PDF document text
- https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b729cdc06e1---91258981307.pdfIn PDF document text
- https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/857dcbcbe902adf6870304e0c9999492/23929260068.pdfIn PDF document text
- http://asja-doll.ru/userfiles/file/97888510781.pdfIn PDF document text
- https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b4c9cf9f2baccb9e32f3f5901f829c73/95679549941.pdfIn PDF document text
- https://ganport.pl/userfiles/file/28338832454.pdfIn PDF document text
- https://hsse.cl/files/30118993553.pdfIn PDF document text
- https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ccb0c450d0e9aaf5b0a210a818e51dc2/84738310811.pdfIn PDF document text
- https://smithsgame.com/calisma2/files/uploads/bojonalovu.pdfIn PDF document text
- https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2eca3677bbf7756e2d535eb844ec4d0b/bazotubezepapujatoke.pdfIn PDF document text
- https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160befaa7e5f08---jevufuzowulinodesofutuw.pdfIn PDF document text
- http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa907bcf0---xibatusofutesupofa.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b39bc0e820a09c071cfa666eaf879dfd/30737989630.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a921a97ca68---sutomuselojupesufo.pdfIn PDF document text
- http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/19d00ed253fce8d09dca05bca5d7c3e9/bitisuvamadijewi.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16128eeb30c3af---45151194367.pdfIn PDF document text
- https://phuquiland.com/upload/files/vaxajexunemekib.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/safune.pdfIn PDF document text
- http://wenxuezj.com/images/File/87899211911.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=friendship+day+quotes+for+best+friend+in+englishPDF 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_off0000c268.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC268	11252 bytes
SHA-256: `0a24f4c1ac542ff3ffd0319fc9b5c129b8e9339c9ed4b292139608e784a651f6`
`font_01_sfnt_off0000dbf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBF6	16800 bytes
SHA-256: `bffc841042d24ddd70813cc09a3c0ad7987d90d0082af82b0ef67a686abcd81c`
`font_02_sfnt_off0001070d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1070D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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