PDF malware analysis — malicious · 7a90fe1a4f1d9a97

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 13:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 9bfa31b4dacaddd940ac082e8ffb6f23 SHA-1: bf43a75e8990fc8430cc808d82e41fa19b690743 SHA-256: 7a90fe1a4f1d9a97d61f1a129c7e484969fb17179a8d22cecb82bc4332f6dde8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting sites. These links likely lead to further malicious content or phishing attempts, indicating a multi-stage attack. The primary purpose appears to be redirecting users to potentially harmful external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://naszemotyle.natura2000.pl/imgturysta/files/81429698173.pdf In PDF document text
- http://galerie45.com/userfiles/file/bipiwubofe.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f50f24f6---98099158191.pdfIn PDF document text
- http://d2dgroup.net/upload/files/zamejobixugevezexaga.pdfIn PDF document text
- https://sanaspinler.com/calisma2/files/uploads/gujosoxafemedaju.pdfIn PDF document text
- http://gamecoast.by/uploads/files/61088495291.pdfIn PDF document text
- https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4fbe48d087fed0983ea1429f74bb3c9c/welifukezapaxawureti.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478a530ca3f---barukazud.pdfIn PDF document text
- https://asiapharma.la/files/files/fuxirosugajodo.pdfIn PDF document text
- http://futurepoolandspa.com/ckfinder/userfiles/files/fomulapaxovagigezi.pdfIn PDF document text
- http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/tubexinovekuxigikilatu.pdfIn PDF document text
- http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vomupitajagipujobabize.pdfIn PDF document text
- http://bephoangdung.vn/uploads/ckfinder/files/maval.pdfIn PDF document text
- https://chennothinterios.com/uploads/file/66174631916.pdfIn PDF document text
- http://ackerviewguesthouse.com/userfiles/file/98044772761.pdfIn PDF document text
- http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614d849265d65---65637677321.pdfIn PDF document text
- http://net-marketing.hu/images/files/44211338964.pdfIn PDF document text
- http://amindoost.ir/images/upload/files/vasabikobafoxujus.pdfIn PDF document text
- https://tavio.ru/files/file/dularurese.pdfIn PDF document text
- http://duda-tech.pl/dudatech/upload/file/87615705203.pdfIn PDF document text
- https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/67650f7e7b9260332b8e930b555ec36a/91778058263.pdfIn PDF document text
- http://wenxuezj.com/images/File/79575224730.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/s6m4tskpmct8922gifv0lgnfvu/sejixidelibijenevunetipak.pdfIn PDF document text
- https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141620c0afe0---pevevoko.pdfIn PDF document text
- https://sledovani2.gpshlidac.cz/www/userfiles/files/22697627988.pdfIn PDF document text
- http://pattarasawat.com/ckfinder/userfiles/files/44420942855.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=technique+pomodoro+pdfPDF 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_off0000b403.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB403	16212 bytes
SHA-256: `cacc8426a0d3fc9b0dea986d499980ff8272efcb8de748e9cb1f97bf7ce109d2`
`font_01_sfnt_off0000dd15.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD15	10620 bytes
SHA-256: `0be8a85f3756a279abba1f0116297781dd15ad79984fa361319ba1154bb90857`
`font_02_sfnt_off0000f4dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4DD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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