PDF malware analysis — malicious · 4d0c32d2a25b00b5

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 02:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 50ae8068f875edc414c623d93df87e70 SHA-1: ee62ac7ddb4734b6bd1f092c60ed1304e4c2f73a SHA-256: 4d0c32d2a25b00b5c3856d082a8d0895ee2484a9504ebcdf4629b6f4269b4d21

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to potentially compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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 http://bjhtdszdh.com/v15/Upload/file/2021519553325083.pdf In PDF document text
- https://termocasasrl.com/file/lafonupofulikizekerijalin.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/474af8732cdadb6e16c9280723e13e47/2774070576.pdfIn PDF document text
- https://299-45.com/CKEdit/upload/files/63587448713.pdfIn PDF document text
- http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe0b4f485---53270568916.pdfIn PDF document text
- https://uppersanduskyrotary.com/cms/files/File/raxolowe.pdfIn PDF document text
- http://jorkurojus.com/userfiles/file/vafolese.pdfIn PDF document text
- http://detikakdeti.ru/img/file/46564524833.pdfIn PDF document text
- http://instant-image.net/UserFiles/Site/File/pedokoxenisavenikoku.pdfIn PDF document text
- http://csaladiegyteruautok.hu/userfiles/files/resakexexar.pdfIn PDF document text
- http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd56dcf07---tulawupunevoderalapupupa.pdfIn PDF document text
- https://xanbiente.de/userfiles/file/30069927250.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072483db86e2---1937097518.pdfIn PDF document text
- http://rutherford58.com/clients/5/5b/5b2824e44de76337c32dfcbc3ee6dba3/File/legatozetopemutob.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3bb7027ece434f88d3a9bd3b02a425d7/40858372324.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/593d66c8118656d51938ad4e649ef873/goxaxujel.pdfIn PDF document text
- https://basisnomor.com/contents//files/posezitudawama.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f418abad7a---vexojoxuwizovi.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/77247354985.pdfIn PDF document text
- http://adaviestransportltd.com/userfiles/file/20943925846.pdfIn PDF document text
- http://sireny.net/share/files/kibativijomifiwukedi.pdfIn PDF document text
- http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c9hjjqjbt04cqj2qh2dbct5g1/22062818208.pdfIn PDF document text
- https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/a76451f6405514628e44277cd9444ba5/zovagiwiluvofovipa.pdfIn PDF document text
- http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7906989534.pdfIn PDF document text
- https://www.mds-horizons.com/upload/files/wilaruxusabufuboripoj.pdfIn PDF document text
- https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/1dn9b6sb1g826h7rh6qfufl9cn/mulibe.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+give+armor+stands+armsPDF 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_off0000df85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF85	10688 bytes
SHA-256: `9f6eb516e091b28f36af11bb40ccc87f8143fbfe7cff42922445682c5b951fe5`
`font_01_sfnt_off0000f7df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7DF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ff1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FF1	19004 bytes
SHA-256: `35ed5d36f5e5ac6243b6568fe9e3bdd16858e3dc10acee957a0e59d087ccacee`

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