PDF malware analysis — malicious · 62c22e819c7600bc

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 15:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 57fe5b0dd7667c4f40c9889d7d73ad8e SHA-1: ef66ca4c76644a13a4c2ffad9da1269770bd1823 SHA-256: 62c22e819c7600bcd8aec03889a07219480b7b2d71bed808b7f4d7165e191519

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable, suggesting a link farm designed to redirect users to malicious content. The ML classifier output of 0.999123 strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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 https://archism.ru/uplcv?utm_term=how+long+will+a+puppy+cry+in+a+crate+at+night PDF link annotation
- https://bdata.vn/upload/files/94833238870.pdfIn PDF document text
- http://zjqzzx.com/uploadfile/file/2021062013143073499.pdfIn PDF document text
- http://dgjst.com/upfile/file/67484454322.pdfIn PDF document text
- http://dolekkoyum.com/admin/UserFiles/file/21904717394.pdfIn PDF document text
- https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2bvhm66ilqt85luma93somk1q3/natasexotogora.pdfIn PDF document text
- https://bostoncake888.com/UserFiles/files/mejibaraginotodowutob.pdfIn PDF document text
- https://mimpishiodua.com/contents//files/sulofigivedakojo.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6b24f315---85645468743.pdfIn PDF document text
- https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/27glo5bdbtdk5bq7subjjph245/8527695690.pdfIn PDF document text
- http://mientrungland.net/uploads/image/files/kuzivupine.pdfIn PDF document text
- http://momsystem.ru/public/file/surawatawa.pdfIn PDF document text
- http://bjhtdszdh.com/v15/Upload/file/2021524841123128.pdfIn PDF document text
- http://youngshiny.com/userfiles/file/1621277862.pdfIn PDF document text
- https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160dee639bab93---fexolatiwomek.pdfIn PDF document text
- https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/09f65f96b23916a5d0e390b142a2a45e/wuwaju.pdfIn PDF document text
- http://czechnews.cz/userfiles/files/8672963002.pdfIn PDF document text
- https://castilloexterior.es/ckfinder/userfiles/files/53950024606.pdfIn PDF document text
- http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/4612048579.pdfIn PDF document text
- http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb53c6b53f---xezoledekodopizibasisi.pdfIn PDF document text
- https://florerialafloresta.com/ckfinder/userfiles/files/zuxefepujawu.pdfIn PDF document text
- https://familienbilstrup.dk/ckfinder/userfiles/files/kawoxajetewepivoruf.pdfIn PDF document text
- http://pantanalmsnews.com.br/ckfinder/userfiles/files/fedumonovasowoduruzefazir.pdfIn PDF document text
- https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/38gcgo3gs8v6oimqgb27g3bp5n/44975937289.pdfIn PDF document text
- 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_off0000de93.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE93	17896 bytes
SHA-256: `9fd2f56d4000a83d89be229c780448f2861263ff010e5193d13ebd7174c60452`
`font_01_sfnt_off00010c1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C1F	10776 bytes
SHA-256: `d5bfe6261a8e71fffe87fede47ed0b97e81cf6454a27cacafcc9f72e3711d0a7`
`font_02_sfnt_off000124f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x124F2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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