PDF malware analysis — malicious · e9351b22e8a6823a

MALICIOUS

PDF

76.2 KB Created: 2021-08-14 05:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 2ee0e652f1b919c86a37c7a247b95e90 SHA-1: a55e6f1a3a5c76a80da35f19484dc049347ea7a7 SHA-256: e9351b22e8a6823a568a806601570b83888dcd5c20345aaabc5e9b7a2dffc8ab

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or lead users to phishing sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristics strongly indicate a malicious link distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://bitree.net/ckfinder/userfiles/files/15370433186.pdf In PDF document text
- https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/8ed6096a497f33cd4c37caad1a5658e3/goxazojotukukizofok.pdfIn PDF document text
- https://solo-enoant.com/content/files/files/muxuvuditek.pdfIn PDF document text
- https://deltaguvenlik.net/userfiles/file/96638700610.pdfIn PDF document text
- http://tomdythai.com/userfiles/files/watatujuratejukozevisopo.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a884d97d5a5---ruxabupiloforowibumoxag.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35d55864f---28957105001.pdfIn PDF document text
- http://php-lounge.de/userfiles/file/40561124295.pdfIn PDF document text
- http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/062d8c5a48d362a2c025bfa3aca0584a/zimagonuker.pdfIn PDF document text
- http://hodinovysoused.cz/upload/file/65519216826.pdfIn PDF document text
- http://honyi.tw/ckfinder/userfiles/file/nimeboruj.pdfIn PDF document text
- http://banphimchuot.com/userfiles/file/46196851799.pdfIn PDF document text
- http://cuatudongsaigon.net/uploads/files/54737969853.pdfIn PDF document text
- http://gulfcoolcontracting.com/uploads/userfiles/file/file/gopometowevovikunelab.pdfIn PDF document text
- https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/17893413577.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094997f04c33---10192484333.pdfIn PDF document text
- https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd87244e77---pefifawosuk.pdfIn PDF document text
- https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/dfhmohm2emn9tqmf4vh1l9o40l/8759985906.pdfIn PDF document text
- http://thechoose.it/file/18050740875.pdfIn PDF document text
- https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/17e1942b6d680a531088d05090240a4c/sewevamifemafefakid.pdfIn PDF document text
- https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5da8e15052b1fa4cadb6c38d08722456/5636020281.pdfIn PDF document text
- https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089888593c5e---rofolisalo.pdfIn PDF document text
- https://elpollopaulino.com/cenavarra_userfiles/files/fupefuxodebusopavo.pdfIn PDF document text
- https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d9d2e69ac5855dbbbd5bbd3e445d92f4/zatuzez.pdfIn PDF document text
- https://spacio.hk/attachment/file/lomilivu.pdfIn PDF document text
- http://geoplan.su/userfiles/file/xupumoxuvesogifovamemuk.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=realidades+2+capitulo+6b+answers+page+126PDF 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_off0000c539.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC539	16512 bytes
SHA-256: `5f0c43c41ff7be70ab4545153fa9c34ed7454eca5dbe1710ab8dabc16a88babf`
`font_01_sfnt_off0000ef57.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF57	11400 bytes
SHA-256: `273fab7ebec92a581185428b062d7f8ac88486948294c1cb2545207d39ff9a2d`
`font_02_sfnt_off00010a17.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A17	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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