PDF malware analysis — malicious · aff1224b9a39cec3

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 23:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: c4ad875d6c7833debe6bcc6bde7d46d2 SHA-1: 455f111882c58acd4b251afb7e9c1314fc4a4880 SHA-256: aff1224b9a39cec36767f9654de0ab6313078f7144b297ccadabc8701d57ca43

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The use of external links and compromised hosting aligns with techniques used to distribute malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=explain+sigma+bond PDF link annotation
- https://we-plus.tw/ckfinder/userfiles/files/44295763578.pdfIn PDF document text
- http://envigest.cz/upload/file/puzuregepifelijusoluvig.pdfIn PDF document text
- http://ybshajiang.com/userfiles/file/2021-09-21/2109210136227095634j4gnojbhzny.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e25685a4---lijadavijagudifef.pdfIn PDF document text
- http://fibertechnique.com/tmp/file/33938133135.pdfIn PDF document text
- https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/famagotip.pdfIn PDF document text
- http://cecev.com/stockages/files/14510362560.pdfIn PDF document text
- https://unique-u.biz/images/uploads/file/xokuwefivolevixasul.pdfIn PDF document text
- https://losaltos.com/wysiwygfiles/file/2521961239.pdfIn PDF document text
- http://decentlogistics.pk/survey/userfiles/files/gadebaninuxibesegat.pdfIn PDF document text
- http://www.benyowsky.com/resources/files/42625101762.pdfIn PDF document text
- https://bulgariapools.com/contents/files/1858801993.pdfIn PDF document text
- http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c210e2e80---19749652510.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/718705cf59e4555744fe4007f97fda5f/gulorolewag.pdfIn PDF document text
- http://boletos.luzservicos.com/ckfinder/userfiles/files/1873790404.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ddbb1d93115149b649843e3b702c7b4a/48321359695.pdfIn PDF document text
- http://inkjetartandimage.com/Uploads/file/wilabab.pdfIn PDF document text
- https://elmawadah.com/userfiles/file/nuvibatopazov.pdfIn PDF document text
- http://scuderieverdina.it/scuderia/userfiles/file/75703395060.pdfIn PDF document text
- http://pamatudarbai.lt/ckfinder/userfiles/files/30465730465.pdfIn PDF document text
- https://turismopontevedra.com/ckfinder/userfiles/files/61973075174.pdfIn PDF document text
- http://yokosohk.com/files/fckfiles/file/gepizevibifove.pdfIn PDF document text
- http://v-lukomorie.com/uploader/files/63177099585.pdfIn PDF document text
- http://cafehinglung.com/uploads/files/tavagex.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_off0000c679.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC679	10628 bytes
SHA-256: `ee2ccefd30ad20b1fa3253fb02663b63909fb69d22ff95aeeba9f569b409c732`
`font_01_sfnt_off0000de37.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE37	16312 bytes
SHA-256: `21a4f20bac5e326a8bc826c7876c0289cc60a7e6baebc6d37536bfd14cce84f0`
`font_02_sfnt_off0001077f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1077F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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